chemfig .tex in runtime (Alan Munn report, 20 Mar 2011 09:09:24)

git-svn-id: svn://tug.org/texlive/trunk@21773 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 1504 insertions, 0 deletions

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+%  __________________________________________________________________
+% |                                                                  |
+% |                                                                  |
+% |                          chemfig v0.4                            |
+% |                                                                  |
+% |                          March 7, 2011                           |
+% |                                                                  |
+% |__________________________________________________________________|
+%
+% This is chemfig.tex, the code of the "chemfig" package.
+%
+% Maintainer: Christian Tellechea
+% E-mail    : unbonpetit@gmail.com
+%             Comments, bug reports and suggestions are welcome.
+% Licence   : Released under the LaTeX Project Public License v1.3c or
+%             later, see http://www.latex-project.org/lppl.txt
+% Copyright : Christian Tellechea 2010-2011
+%
+% The "chemfig" package consists of the 8 following files:
+%   chemfig.tex (this file)
+%   chemfig.sty (the package file for LaTeX)
+%   t-chemfig.tex (the package file for conTeXt)
+%   README
+%   chemfig_doc_en.tex, chemfig_doc_en.pdf (english manual)
+%   chemfig_doc_fr.tex, chemfig_doc_fr.pdf (manual in french)
+%
+% --------------------------------------------------------------------
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%
+% %     http://www.latex-project.org/lppl.txt
+%
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+% --------------------------------------------------------------------
+% This work has the LPPL maintenance status `maintained'.
+%
+% The Current Maintainer of this work is Christian Tellechea
+% --------------------------------------------------------------------
+%
+% Sauvegarde tous les catcodes des caract\`eres sp\'eciaux sauf #
+
+\begingroup
+\def\X#1{\catcode\number`#1=\number\catcode`#1\relax}
+% Sauve tous les catcode sauf #
+\expandafter\xdef\csname CF@savedcatcode\endcsname{%
+	\X\[\X\]\X\:\X\(\X\)\X\,\X\-\X\=\X\~\X\!\X\?\X\<\X\>\X\;\X\*\X\|\X\@%
+}
+\endgroup
+
+% Pour la dur\'ee de lecture du package, changer les catcodes :
+\catcode`\[12 \catcode`\]12 \catcode`\:12 \catcode`\(12
+\catcode`\)12 \catcode`\,12 \catcode`\-12 \catcode`\=12
+\catcode`\~12 \catcode`\!12 \catcode`\?12 \catcode`\<12
+\catcode`\>12 \catcode`\;12 \catcode`\*12 \catcode`\|12
+\catcode`\@11 \catcode`\#6
+
+\def\CF@def#1{%
+	\ifdefined#1%
+		\errmessage{Package chemfig Error: the macro \string#1\space is already defined. Please, email the author.}%
+	\fi
+	\def#1%
+}
+
+\CF@def\CF@ver         {0.4}
+\CF@def\CF@date        {2011/03/07}
+\CF@def\CF@fr@date     {7 mars 2011}
+\CF@def\CF@en@date     {March 7, 2011}
+\CF@def\CF@package@name{chemfig}
+
+\expandafter\ifx\csname @latexerr\endcsname\relax% on n'utilise pas LaTeX ?
+	\ifdefined\tikzpicture\else
+		\def\CF@next@action{\input tikz.tex}%
+		\expandafter\CF@next@action
+	\fi
+	\immediate\write\m@ne{Package: \CF@package@name\space\CF@date\space\space v\CF@ver\space\space Draw molecule with an easy syntax}%
+	\long\def\@firstoftwo#1#2{#1}
+	\long\def\@secondoftwo#1#2{#2}
+	\long\def\@firstofone#1{#1}
+	\long\def\@gobble#1{}
+	\long\def\@gobbletwo#1#2{}
+	\def\@car#1#2\@nil{#1}
+	\def\@makeother#1{\catcode`#1=12\relax}
+	\long\def\@ifnextchar#1#2#3{%
+		\let\reserved@d=#1%
+		\def\reserved@a{#2}%
+		\def\reserved@b{#3}%
+		\futurelet\@let@arg\@ifnch}
+	\def\@ifnch{%
+		\ifx\@let@arg\@sptoken
+			\let\reserved@c\@xifnch
+		\else
+			\ifx\@let@arg\reserved@d
+				\let\reserved@c\reserved@a
+			\else
+				\let\reserved@c\reserved@b
+			\fi
+		\fi
+		\reserved@c}
+	\def\:{\let\@sptoken= } \:
+	\def\:{\@xifnch} \expandafter\def\: {\futurelet\@let@arg\@ifnch}
+	\def\@ifstar#1{\@ifnextchar *{\@firstoftwo{#1}}}
+	\long\def\@testopt#1#2{\@ifnextchar[{#1}{#1[{#2}]}}
+	\def\@empty{}
+	\def\space{ }
+	\CF@def\printatom#1{\ifmmode\rm#1\else$\rm#1$\fi}% \printatom pour TeX et ConTeXt
+\else% fin des d\'efinitions LaTeX
+	\CF@def\printatom#1{\ensuremath{\mathrm{#1}}}% \printatom pour LaTeX.
+\fi
+
+\newcount\CF@cnt@atomingroup
+\newcount\CF@cnt@groupnumber
+\newcount\CF@cnt@atomnumber
+\newcount\CF@cnt@cycle
+
+\newif\ifCF@incycle
+\newif\ifCF@cyclearc
+\newif\ifCF@definesubmol
+
+\newdimen\CF@dim
+
+\newbox\CF@lewis@box
+\newbox\CF@box@boxa
+\newbox\CF@box@boxb
+\newbox\CF@stuff@box
+
+\newwrite\CF@unused
+
+\CF@def\CF@specialchar@list{\[\]\:\(\)\,\-\=\~\!\?\<\>\;\*\|\#\@}
+
+\CF@def\CF@sanitize@catcode{%
+	\expandafter\CF@sanitize@catcode@i\expandafter{\CF@specialchar@list}%
+}
+
+\CF@def\CF@sanitize@catcode@i#1{%
+	\ifx\@empty#1\@empty
+	\else
+		\expandafter\@makeother\@car#1\@nil
+		\CF@swap@fi
+		\expandafter\CF@sanitize@catcode@i\expandafter{\@gobble#1}%
+	\fi
+}
+
+\CF@def\CF@save@catcode{%
+	\let\CF@restore@catcode\@empty
+	\expandafter\CF@save@catcode@i\expandafter{\CF@specialchar@list}%
+}
+
+\CF@def\CF@save@catcode@i#1{%
+	\ifx\@empty#1\@empty
+	\else
+		\CF@edefadd@tocs\CF@restore@catcode{\catcode`\expandafter\noexpand\@car#1\@nil=\number\expandafter\catcode\expandafter`\@car#1\@nil\noexpand\space}%
+		\CF@swap@fi
+		\expandafter\CF@save@catcode@i\expandafter{\@gobble#1}%
+	\fi
+}
+
+\CF@def\CF@node@content{\expandafter\printatom\expandafter{\csname atom@\number\CF@cnt@atomnumber\endcsname\CF@node@strut}}
+
+\CF@def\chemskipalign{%
+	\ifx\CF@bond@outcontentsaved\@empty% sauf si un \chemskipalign a \'et\'e fait \`a l'atome pr\'ec\'edent
+		\global\let\CF@bond@outcontentsaved\CF@bond@outcontent% sauvegarder l'atome d'o\`u vient la liaison
+	\fi
+	\let\CF@node@strut\@empty
+}
+
+\CF@def\CF@empty@node{{}}
+
+\CF@def\CF@cycle@inraduiscoeff{0.75}% coeff multiplicateur du rayon des arcs dans les cycles
+
+\CF@def\setcrambond#1#2#3{%
+	\def\CF@cram@basewidth{#1}%
+	\ifx\@empty#2\@empty\def\CF@cram@dashlength{1pt}\else\def\CF@cram@dashlength{#2}\fi
+	\ifx\@empty#3\@empty\def\CF@cram@dashsep{2pt}\else\def\CF@cram@dashsep{#3}\fi}
+\setcrambond{}{}{}
+
+\CF@def\setatomsep{\def\CF@atom@sep}% espacement des atomes li\'es
+\setatomsep{}
+
+\CF@def\setbondoffset{\def\CF@bond@offset}% offset des liaisons
+\setbondoffset{2pt}
+
+\CF@def\setdoublesep{\def\CF@double@sep}
+\setdoublesep{2pt}
+
+\CF@def\definesubmol{\CF@definesubmoltrue\CF@def@submol}
+\CF@def\redefinesubmol{\CF@definesubmolfalse\CF@def@submol}
+
+\CF@def\CF@def@submol#1{%
+	\begingroup
+	\def\CF@tmp@str{#1}%
+	\catcode`[\@ne\catcode`]\tw@
+	\futurelet\CF@toks@a\CF@test@nxttok
+}
+
+\CF@def\CF@test@nxttok{%
+	\if[\noexpand\CF@toks@a
+		\expandafter\expandafter\expandafter\CF@grab@optalias\expandafter\expandafter\expandafter{\expandafter\CF@tmp@str\expandafter}%
+	\else
+		\CF@swap@fi
+		\expandafter\endgroup
+		\expandafter\CF@def@submol@i\expandafter{\CF@tmp@str}{}%
+	\fi
+}
+
+\CF@def\CF@grab@optalias#1#2{%
+	\endgroup
+	\begingroup
+	\everyeof{\@nil}\endlinechar\m@ne
+	\expandafter\assign@tonil\expandafter\CF@tmp@str\scantokens{#2}%
+	\CF@expand@second{\endgroup\CF@def@submol@i{#1}}\CF@tmp@str
+}
+
+\CF@def\CF@def@submol@i#1#2#3{% #1 nom, #2 = code si liaison arrive de droite , #3 = code si liaison arrive de gauche
+	\ifcat\relax\expandafter\noexpand\@car#1\@nil% si #1 est une s\'equence de contr\^ole
+		\expandafter\ifdefined\@car#1\@nil
+			\ifCF@definesubmol
+				\immediate\write\CF@unused{Package \CF@package@name\space Warning: the macro \expandafter\string\@car#1\@nil\space is already defined, the previous definition is lost on input line \the\inputlineno.}%
+			\fi
+		\fi
+		\ifx\@empty#2\@empty
+			\expandafter\def\@car#1\@nil{\@empty#3}%
+		\else
+			\expandafter\def\@car#1\@nil{%
+				\romannumeral
+				\ifdim\CF@current@angle pt>90pt
+					\ifdim\CF@current@angle pt<270pt
+						\expandafter\expandafter\expandafter\@firstoftwo
+					\else
+						\expandafter\expandafter\expandafter\@secondoftwo
+					\fi
+				\else
+					\expandafter\@secondoftwo
+				\fi
+				{\z@#2}{\z@#3}}%
+		\fi
+	\else
+		\ifcsname CF@@#1\endcsname
+			\ifCF@definesubmol
+				\immediate\write\CF@unused{Package \CF@package@name\space Warning:the submol "#1" is already defined, the previous definition is lost on input line \the\inputlineno.}%
+			\fi
+		\fi
+		\ifx\@empty#2\@empty
+			\expandafter\def\csname CF@@#1\endcsname{\@empty#3}% "\@empty" car tout ça sera 1-d\'evelopp\'e lorsque rencontr\'ee
+		\else
+			\expandafter\def\csname CF@@#1\endcsname{%
+				\romannumeral% donnera le d\'eveloppement souhait\'e en 1 coup
+				\ifdim\CF@current@angle pt>90pt
+					\ifdim\CF@current@angle pt<270pt
+						\expandafter\expandafter\expandafter\@firstoftwo
+					\else
+						\expandafter\expandafter\expandafter\@secondoftwo
+					\fi
+				\else
+					\expandafter\@secondoftwo
+				\fi
+				{\z@#2}{\z@#3}}%
+		\fi
+	\fi
+}
+
+\CF@def\CF@if@integer#1{%
+	\begingroup
+	\afterassignment\CF@after@integer
+	\CF@cnt@cycle0#1\relax
+}
+
+\CF@def\CF@after@integer#1\relax{%
+	\endgroup
+	\ifx\@empty#1\@empty\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+}
+
+\CF@def\CF@swap@fi#1\fi{\fi#1}
+
+\CF@def\CF@gobble@tonil#1\@nil{}
+
+\CF@def\CF@expafterarg@ntimes#1#2#3{%
+	\CF@expafterarg@ntimes@i{#1}{#3}%
+	\expandafter\CF@swap@arg\expandafter{\CF@tmp@str}{#2}%
+}
+
+\CF@def\CF@expafterarg@ntimes@i#1#2{%
+	\ifnum#1=\z@
+		\def\CF@tmp@str{#2}%
+	\else
+		\CF@swap@fi
+		\expandafter\CF@expafterarg@ntimes@i\expandafter{\number\numexpr#1-1\expandafter}\expandafter{#2}%
+	\fi
+}
+
+\CF@def\CF@swap@arg#1#2{#2{#1}}
+
+\CF@def\CF@expand@second#1#2{\expandafter\CF@swap@arg\expandafter{#2}{#1}}
+
+\CF@def\CF@swap@char#1#2{#2#1}
+
+\CF@def\CF@expand@afterfirst#1#2{\expandafter\CF@swap@char\expandafter{#2}{#1}}
+
+\CF@def\CF@edef@second#1#2{%
+	\edef\CF@tmp@str{#2}%
+	\expandafter\CF@swap@char\expandafter{\CF@tmp@str}{#1}%
+}
+
+\CF@def\CF@add@tocs#1#2{\expandafter\def\expandafter#1\expandafter{#1#2}}
+
+\CF@def\CF@expadd@tocs#1#2{\expandafter\CF@add@tocs\expandafter#1\expandafter{#2}}
+
+\CF@def\CF@edefadd@tocs#1#2{%
+	\edef\CF@tmp@str{#2}%
+	\expandafter\CF@add@tocs\expandafter#1\expandafter{\CF@tmp@str}%
+}
+
+\CF@def\CF@if@firsttokmatch#1#2{% est ce que #1 et #2 commencent par les mêmes tokens ?
+	\futurelet\CF@toks@a\CF@gobble@tonil#1\relax\@nil
+	\futurelet\CF@toks@b\CF@gobble@tonil#2\relax\@nil
+	\ifx\CF@toks@a\CF@toks@b\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+}
+
+\CF@def\CF@if@firsttokin#1{% teste si le token qui commence #1 appartient aux tokens mis dans #2
+	\futurelet\CF@toks@a\CF@gobble@tonil#1\relax\@nil
+	\CF@if@firsttokin@i
+}
+
+\CF@def\CF@if@firsttokin@i#1{%
+	\ifx\@empty#1\@empty
+		\expandafter\@secondoftwo
+	\else
+		\futurelet\CF@toks@b\CF@gobble@tonil#1\relax\@nil
+		\ifx\CF@toks@a\CF@toks@b
+			\expandafter\expandafter\expandafter\@firstoftwo
+		\else
+			\CF@swap@fi\CF@swap@fi
+			\expandafter\CF@if@firsttokin@i\expandafter{\@gobble#1}%
+		\fi
+	\fi
+}
+
+\CF@def\CF@if@instr#1#2{%
+	\def\CF@if@instr@i##1#2##2\@nil{\ifx\@empty##2\@empty\expandafter\@secondoftwo\else\expandafter\@firstoftwo\fi}%
+	\CF@if@instr@i#1\@@nil#2\@nil
+}
+
+\CF@def\CF@after@space#1 #2\@nil{#2}
+
+\CF@def\CF@seek@node#1#2#3{% cherche un noeud au d\'ebut de #1 l'assigne dans la sc #2 et met le reste dans #3
+	\let#2\@empty
+	\def#3{#1}%
+	\futurelet\CF@toks@a\CF@gobble@tonil#1\relax\@nil
+	\ifx\CF@toks@a\@sptoken\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+		{\expandafter\CF@seek@node@i\expandafter{\CF@after@space#1\@nil}#2#3}% ignore l'espace qui commence un groupe d'atome
+		{\CF@seek@node@i{#1}#2#3}%
+}
+
+\CF@def\CF@seek@node@i#1#2#3{%
+	\ifx\@empty#1\@empty
+		\let#3\@empty
+	\else
+		\futurelet\CF@toks@a\CF@gobble@tonil#1\relax\@nil
+		\ifx\CF@toks@a\@sptoken\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+			{\CF@add@tocs#2{ }%
+			\CF@swap@fi\expandafter\CF@seek@node@i\expandafter{\CF@after@space#1\@nil}#2#3%
+			}%
+			{\ifx\CF@toks@a\bgroup\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+				{\CF@expadd@tocs#2{\expandafter{\@car#1\@nil}}%
+				\CF@swap@fi\expandafter\CF@seek@node@i\expandafter{\@gobble#1}#2#3%
+				}%
+				{\CF@if@firsttokin@i{-=(*<>!~}%
+					{\def#3{#1}}%
+					{\CF@expadd@tocs#2{\@car#1\@nil}%
+					\CF@swap@fi\expandafter\CF@seek@node@i\expandafter{\@gobble#1}#2#3%
+					}%
+				}%
+			}%
+	\fi
+}
+
+% on sait que #1 commence par -,=,~,<,>. On analyse cette liaison
+% #2 reçoit le type de liaisons (1 pour -, 2 pour =, 3 pour ~)
+\CF@def\CF@bond@findnum#1#2{%
+	\futurelet\CF@toks@a\CF@gobble@tonil#1\@nil
+	\edef#2{%
+		\ifx-\CF@toks@a1%
+		\else
+			\ifx=\CF@toks@a2%
+			\else
+				\ifx~\CF@toks@a3%
+				\else
+					\ifx>\CF@toks@a4%
+					\else
+						\ifx<\CF@toks@a5%
+						\else0% si 0 --> il y a une erreur non dûe \`a l'utilisateur
+						\fi
+					\fi
+				\fi
+			\fi
+		\fi}%
+	\ifnum#2>\thr@@% si c'est une liaison de Cram
+		\expandafter\futurelet\expandafter\CF@toks@a\expandafter\CF@gobble@tonil\@gobble#1\@nil% chope le caract\`ere suivant
+		\ifx:\CF@toks@a
+			\edef#2{\number\numexpr#2+2}% si c 'est un ":", signe du pointill\'e, ajoute 2
+		\else
+			\ifx|\CF@toks@a
+				\edef#2{\number\numexpr#2+4}% si c 'est un "|", signe du triangle \'evid\'e, ajouter 4
+			\fi
+		\fi
+	\fi
+}
+
+\CF@def\CF@analyse@bondoffset#1,#2\@nil{%
+	\def\CF@start@offset{#1}\def\CF@end@offset{#2}%
+}
+
+\expandafter\CF@def\expandafter\CF@grab@bondoffset\string#(#1)#2\@nil{%
+	\ifx\@empty#1\@empty
+	\else
+		\CF@if@instr{#1},%
+			{\CF@analyse@bondoffset#1\@nil}%
+			{\def\CF@start@offset{#1}}%
+	\fi
+	\def\CF@remain@afterbond{#2}%
+}
+
+\CF@def\CF@analyse@bond#1#2{%
+	\CF@bond@findnum{#1}#2%
+	\expandafter\def\expandafter\CF@remain@afterbond\expandafter{\@gobble#1}%mange le premier signe de la liaison
+	\let\CF@doublebond@type\z@
+	\ifnum#2=\tw@% si c'est une double liaison, regarde s'il y a un + ou - derri\`ere
+		\expandafter\futurelet\expandafter\CF@toks@a\expandafter\CF@gobble@tonil\@gobble#1\@nil
+		\ifx^\CF@toks@a
+			\let\CF@doublebond@type\@ne
+			\expandafter\def\expandafter\CF@remain@afterbond\expandafter{\@gobbletwo#1}% mange le "^"
+		\else
+			\ifx_\CF@toks@a
+				\let\CF@doublebond@type\tw@
+				\expandafter\def\expandafter\CF@remain@afterbond\expandafter{\@gobbletwo#1}% mange le "_"
+			\fi
+		\fi
+	\else
+		\ifnum#2>5 % si c'est une laision de Cram pointill\'ee ou triangle \'evid\'e
+			\expandafter\def\expandafter\CF@remain@afterbond\expandafter{\@gobbletwo#1}% mange un caract\`ere de plus
+		\fi
+	\fi
+	\expandafter\expandafter\expandafter\CF@if@firsttokmatch\expandafter\expandafter\expandafter{\expandafter\CF@remain@afterbond\expandafter}\string##%
+		{\expandafter\CF@grab@bondoffset\CF@remain@afterbond\@nil}%
+		\relax
+	\expandafter\expandafter\expandafter\CF@if@firsttokmatch\expandafter\expandafter\expandafter{\expandafter\CF@remain@afterbond\expandafter}\string @%
+		{\expandafter\CF@grab@movearg\CF@remain@afterbond\@nil}%
+		\relax
+	\expandafter\CF@if@firsttokmatch\expandafter{\CF@remain@afterbond}[%
+		{\expandafter\CF@analyse@optarg\CF@remain@afterbond\@nil\CF@remain@afterbond}%
+		{\let\CF@current@stringangle\CF@default@stringangle
+		\let\CF@current@length\CF@default@length
+		\let\CF@current@fromatom\CF@default@fromatom
+		\let\CF@current@toatom\CF@default@toatom
+		\let\CF@current@tikz\CF@default@tikz
+		\let\CF@movebond@name\@empty
+		}%
+	\ifCF@incycle
+		\pgfmathparse{360/\CF@cycle@num+\CF@initcycle@angle}%
+		\edef\CF@current@stringangle{::+\pgfmathresult}%
+		\def\CF@initcycle@angle{0}%
+		\let\CF@current@length\CF@default@length% et on ignore la longueur de liaison sp\'ecifi\'ee
+	\fi
+	\expandafter\CF@set@bondangle\expandafter{\CF@current@stringangle}\CF@current@angle
+}
+
+\CF@def\CF@set@bondangle#1#2{% le code de la direction est contenu dans #1, en sortie, #2 contient l'angle
+	\ifx\@empty#1\@empty%
+		\let#2\CF@default@angle
+	\else
+		\if:\expandafter\noexpand\@car#1\@nil
+			\if:\expandafter\expandafter\expandafter\noexpand\expandafter\@car\@gobble#1\@nil
+				\pgfmathparse{\CF@previous@angle+\expandafter\@gobble\@gobble#1}%
+				\let#2\pgfmathresult
+			\else
+				\expandafter\def\expandafter#2\expandafter{\@gobble#1}
+			\fi% puis normalise l'angle entre 0 et 360
+			\ifdim\ifdim#2pt<\z@-\fi#2pt>360pt % si |#2|>360
+				\pgfmathparse{#2-360*floor(#2/360)}%
+				\ifdim\pgfmathresult pt<\z@\pgfmathparse{\pgfmathresult+360}\fi
+				\let#2\pgfmathresult
+			\else
+				\ifdim#2pt<\z@
+					\pgfmathparse{#2+360}%
+					\let#2\pgfmathresult
+				\fi
+			\fi
+		\else
+			\ifnum#1>7
+				\pgfmathparse{#1-floor(#1/8)*8}%
+				\ifdim\pgfmathresult pt<\z@\pgfmathparse{\pgfmathresult+8}\fi
+				\edef#2{\ifcase\expandafter\CF@int@part\pgfmathresult\@nil0\or45\or90\or135\or180\or225\or270\or315\else-1\fi}% angle =-1 --> erreur
+			\else
+				\edef#2{\ifcase#1 0\or45\or90\or135\or180\or225\or270\or315\else-1\fi}%
+			\fi
+		\fi
+	\fi
+}
+
+\CF@def\CF@int@part#1.#2\@nil{#1 }
+
+\CF@def\CF@analyse@movearg#1,#2\@nil#3{%
+	\def#3{#1}\def\CF@movebond@coeff{#2}%
+}
+
+% Argument limit\'es l\'egitimes ici car #2 (qui est ce qui suit "@{<nom>}" dans l'argument optionnel) ne DOIT
+% pas commencer par une accolade.
+\expandafter\CF@def\expandafter\CF@grab@movearg\string @#1#2\@nil{%
+	\CF@if@instr{#1},%
+		{\CF@analyse@movearg#1\@nil\CF@movebond@name}%
+		{\def\CF@movebond@name{#1}\def\CF@movebond@coeff{0.5}}%
+	\def\CF@remain@optarg{#2}%
+}
+
+\CF@def\CF@testempty@andassign#1#2#3{\ifx\@empty#2\@empty\let#1#3\else\def#1{#2}\fi}
+
+\CF@def\CF@sanitize@lastitem#1,\@empty#2\@nil{#1}
+
+\CF@def\CF@parse@optlist#1,#2,#3,#4,#5\@nil{%
+	\CF@testempty@andassign\CF@current@stringangle{#1}\CF@default@stringangle
+	\CF@testempty@andassign\CF@current@length{#2}\CF@default@length
+	\CF@testempty@andassign\CF@current@fromatom{#3}\CF@default@fromatom
+	\CF@testempty@andassign\CF@current@toatom{#4}\CF@default@toatom
+	\expandafter\CF@testempty@andassign\expandafter\CF@current@tikz\expandafter{\CF@sanitize@lastitem#5,\@empty\@nil}\CF@default@tikz
+}%
+
+\CF@def\CF@analyse@optarg[#1]#2\@nil#3{%
+	\ifx\@empty#1\@empty
+	\else
+		\CF@expand@afterfirst{\CF@if@firsttokmatch{#1}}{\string @}%
+			{\CF@grab@movearg#1\@nil}%
+			{\let\CF@movebond@name\@empty
+			\def\CF@remain@optarg{#1}}%
+		\expandafter\CF@parse@optlist\CF@remain@optarg,\@empty,\@empty,\@empty,\@empty\@nil
+		\def#3{#2}%
+	\fi
+}
+
+\CF@def\CF@seek@submol{%
+	\expandafter\CF@if@firsttokmatch\expandafter{\CF@remain@molecule}!%
+		{\expandafter\expandafter\expandafter\def\expandafter\expandafter\expandafter
+			\CF@remain@molecule\expandafter\expandafter\expandafter{\expandafter\@gobble\CF@remain@molecule}% enl\`eve le ``!''
+		\ifcat\relax\expandafter\expandafter\expandafter\noexpand\expandafter\@car\CF@remain@molecule\@nil
+			\CF@expafterarg@ntimes5{\def\CF@insert@submol}{\expandafter\@car\CF@remain@molecule\@nil}%
+		\else
+			\CF@expafterarg@ntimes3{\def\CF@insert@submol}{\csname CF@@\expandafter\@car\CF@remain@molecule\@nil\endcsname}%
+		\fi
+		\expandafter\expandafter\expandafter\def\expandafter\expandafter\expandafter\CF@remain@molecule\expandafter\expandafter\expandafter
+			{\csname CF@insert@submol\expandafter\expandafter\expandafter\endcsname\csname @gobble\expandafter\endcsname\CF@remain@molecule}%
+		\CF@seek@submol
+		}%
+		\relax
+}
+
+\CF@def\CF@insert@emptygroup#1{% ins\`ere {} au d\'ebut de la sc #1
+	\expandafter\def\expandafter#1\expandafter{\expandafter{\expandafter}#1}%
+}
+
+\CF@def\CF@make@other#1{%
+	\ifx\@empty#1\@empty
+	\else
+		\expandafter\@makeother\@car#1\@nil
+		\CF@swap@fi
+		\expandafter\CF@make@other\expandafter{\@gobble#1}%
+	\fi
+}
+
+\CF@def\chemfig{\@testopt\CF@chemfig@i{}}
+
+\CF@def\CF@chemfig@i[#1]{\@testopt{\CF@chemfig@ii[#1]}{}}
+
+\CF@def\CF@chemfig@ii[#1][#2]{%
+	\edef\CF@tmp@str{[remember picture,every node/.style={anchor=base,inner sep=0pt,outer sep=0pt,minimum size=0pt\ifx\@empty#2\@empty\else,#2\fi},baseline\ifx\@empty#1\@empty\else,#1\fi]}%
+	\expandafter\tikzpicture\CF@tmp@str
+	\begingroup
+		\let\CF@hook@list\@empty
+		\ifx\CF@atom@sep\@empty\def\CF@atom@sep{3em}\fi
+		\ifx\CF@cram@basewidth\@empty\def\CF@cram@basewidth{1.5ex}\fi
+		\CF@incyclefalse
+		\CF@cnt@groupnumber\z@
+		\let\CF@last@action\z@% 0=d\'ebut du dessin 1=trac\'e d'un noeud 2=trac\'e d'une liaison
+		\let\CF@start@offset\@empty
+		\let\CF@end@offset\@empty
+		\let\CF@bond@outcontentsaved\@empty
+		\def\CF@cycle@anglecorrection{180/\CF@cycle@num}%
+		\everyeof{\@nil}\endlinechar\m@ne
+		\CF@sanitize@catcode
+		\CF@chemfig@iii
+}
+
+\CF@def\CF@chemfig@iii#1{%
+	\CF@chemfig@iv{#1}%
+	\endtikzpicture
+	\let\CF@split@state\z@
+}
+
+\CF@def\CF@chemfig@iv#1{% #1 est le code de la mol\'ecule
+	\ifnum\CF@last@action=\thr@@
+		\ifCF@incycle
+			\def\CF@default@angle{0}%
+		\else
+			\ifnum\CF@cnt@cycle=\z@% si c'est le d\'ebut d'un cycle
+				\pgfmathparse{\CF@previous@angle+180+\CF@cycle@anglecorrection}% on met la liaison \`a +180° + correction
+			\else
+				\pgfmathparse{\CF@previous@angle-90+180/\CF@cycle@num}% sinon \`a la bissectrice du sommet du cycle
+			\fi
+			\let\CF@default@angle\pgfmathresult
+		\fi
+		\let\CF@default@stringangle\@empty
+	\else
+		\def\CF@default@angle{0}%
+		\def\CF@default@stringangle{:0}% angle pris par d\'efaut si le champ est vide
+	\fi
+	\let\CF@current@angle\CF@default@angle
+	\ifCF@incycle\else\def\CF@default@length{1}\fi% longueur de la liaison par d\'efaut sauf pour un cycle o\`u on prend celle en cours
+	\let\CF@default@fromatom\@empty% numero de l'atome d'o\`u partent les liaisons par d\'efaut
+	\let\CF@default@toatom\@empty% num\'ero de l'atome o\`u arrivent les laisons par d\'efaut
+	\let\CF@default@tikz\@empty
+	\if[\expandafter\noexpand\@car#1\@nil
+		\CF@analyse@optarg#1\@nil\CF@remain@molecule
+		\expandafter\CF@set@bondangle\expandafter{\CF@current@stringangle}\CF@current@angle
+		\let\CF@default@angle\CF@current@angle
+		\let\CF@previous@angle\CF@current@angle
+		\unless\ifx\@empty\CF@current@stringangle\let\CF@default@angle\CF@current@angle\fi
+		\unless\ifx\@empty\CF@current@length\let\CF@default@length\CF@current@length\fi
+		\unless\ifx\@empty\CF@current@fromatom\let\CF@default@fromatom\CF@current@fromatom\fi
+		\unless\ifx\@empty\CF@current@toatom\let\CF@default@toatom\CF@current@toatom\fi
+		\unless\ifx\@empty\CF@current@tikz\let\CF@default@tikz\CF@current@tikz\fi
+	\else
+		\def\CF@remain@molecule{#1}% on prend tout puisque pas d'argument optionnel au d\'ebut
+	\fi% apr\`es l'argument entre crochet au d\'ebut, on passe \`a la suite
+	\ifCF@incycle% si on commence un cycle
+		\let\CF@current@angle\CF@previous@angle
+	\else
+		\let\CF@current@angle\CF@default@angle
+	\fi
+	\edef\CF@default@stringangle{:\CF@default@angle}%
+	\let\CF@current@length\CF@default@length
+	\let\CF@current@fromatom\CF@default@fromatom
+	\let\CF@current@toatom\CF@default@toatom
+	\let\CF@current@tikz\CF@default@tikz
+	\ifnum\CF@last@action=\z@
+		\let\CF@previous@angle\CF@default@angle
+		\node(CF@node){};
+		\expandafter\CF@if@firsttokin\expandafter{\CF@remain@molecule}{-=(*~?<>}%
+			{\CF@insert@emptygroup\CF@remain@molecule}%
+			\relax
+	\fi
+	\CF@chemfig@v
+}
+
+\CF@def\CF@chemfig@v{%
+	\let\CF@next@action\CF@chemfig@v% \`a prioi, on reboucle
+	\ifx\CF@remain@molecule\@empty
+		\let\CF@next@action\endgroup
+	\else
+		\CF@seek@submol
+		\expandafter\CF@seek@node\expandafter{\CF@remain@molecule}\CF@current@atomgroup\CF@remain@molecule
+		\ifx\@empty\CF@current@atomgroup% pas de noeud pour commencer ?
+			\def\CF@bond@outnode{n\CF@last@groupnumber-%
+				 \ifx\CF@current@fromatom\@empty
+					 \ifdim\CF@current@angle pt<90pt \number\CF@cnt@atomingroup
+					 \else\ifdim\CF@current@angle pt>270pt \number\CF@cnt@atomingroup\else1\fi
+					 \fi
+				 \else\CF@current@fromatom
+				 \fi}%
+			\expandafter\futurelet\expandafter\CF@toks@a\expandafter\CF@gobble@tonil\CF@remain@molecule\relax\@nil
+			\CF@if@firsttokin@i{-=<>~}% la suite est une liaison
+				{\ifnum\CF@last@action=\tw@% c'est la deuxi\`eme liaison cons\'ecutive ?
+					\CF@insert@emptygroup\CF@remain@molecule% ins\`ere un groupe vide
+					\edef\CF@bond@outnode{\CF@bond@outnode}%
+				\else
+					\ifCF@incycle\advance\CF@cnt@cycle\@ne\fi
+					\expandafter\CF@analyse@bond\expandafter{\CF@remain@molecule}\CF@bond@type
+					\edef\CF@bond@outnode{\CF@bond@outnode}%
+					\let\CF@remain@molecule\CF@remain@afterbond
+					\ifCF@incycle
+						\ifnum\CF@cnt@cycle=\CF@cycle@num\relax
+							\expandafter\expandafter\expandafter\@firstoftwo
+						\else
+							\expandafter\expandafter\expandafter\@secondoftwo
+						\fi
+					\else
+						\expandafter\@secondoftwo
+					\fi
+						{\let\CF@next@action\endgroup
+						\CF@draw@bond\CF@bond@type{\CF@bond@outnode}{\CF@hook@cycle}\CF@previous@atomgroup\CF@hook@atomgroup
+						}%
+						{\node[at=(\CF@bond@outnode),shift=(\ifcase\CF@split@state\or180-\or-\fi\CF@current@angle:\CF@current@length*\CF@atom@sep)](CF@node){};
+						\let\CF@previous@angle\CF@current@angle
+						\let\CF@last@action\tw@
+						}%
+				\fi
+				\ifx\CF@remain@molecule\@empty% plus rien apr\`es la liaison -> ins\`ere un groupe vide
+					\CF@insert@emptygroup\CF@remain@molecule
+				\fi
+				}%
+				{\edef\CF@bond@outnode{\CF@bond@outnode}% \'evalue le l'atome de d\'epart de liaison
+				\ifx(\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi% une parenth\`ese pour commencer ?
+					{\ifnum\CF@last@action=\tw@% il y avait une liaison juste avant ?
+						\CF@insert@emptygroup\CF@remain@molecule
+					\else
+						\expandafter\CF@grab@submol\expandafter{\CF@remain@molecule}%
+						\begingroup
+							\ifCF@incycle\let\CF@last@action\thr@@\fi% on \'etait dans un cycle
+							\CF@incyclefalse
+							\aftergroup\CF@chemfig@v
+							\def\CF@next@action{\expandafter\CF@chemfig@iv\expandafter{\CF@sub@mol}}%
+					\fi
+				    }%
+					{\ifx\CF@remain@molecule\@empty
+						\let\CF@next@action\endgroup
+					\else% ce qui reste apr\`es le noeud courant n'est pas vide, ne commence pas par "-=~", ni par une parenth\`ese
+						\ifx*\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi% un cycle ?
+						{\ifnum\CF@last@action=\tw@
+							\CF@insert@emptygroup\CF@remain@molecule% ins\`ere un groupe vide
+						\else
+							\ifCF@incycle\let\CF@last@action\thr@@\fi% on \'etait dans un cycle
+							\ifnum\CF@last@action=\thr@@\let\CF@lastcycle@num\CF@cycle@num\fi
+							\CF@expafterarg@ntimes2\CF@if@firsttokmatch{\expandafter\@gobble\CF@remain@molecule}*% un 2\`e "*" ?
+								{\CF@expafterarg@ntimes2{\def\CF@remain@molecule}{\expandafter\@gobble\CF@remain@molecule}% enl\`eve la 1er \'etoile
+								\CF@expafterarg@ntimes2\CF@if@firsttokmatch{\expandafter\@gobble\CF@remain@molecule}[% un crochet ensuite ?
+									{\expandafter\CF@cycle@parsepreamblewithoptarg\CF@remain@molecule\@nil% \begingroup inclus
+									}%
+									{\def\CF@cyclearc@startangle{0}\def\CF@cyclearc@endangle{360}%
+									\let\CF@cyclearc@directtikz\@empty
+									\expandafter\CF@cycle@parsepreamble\CF@remain@molecule\@nil% \begingroup inclus
+									}%
+								\CF@cyclearctrue
+								}%
+								{\expandafter\CF@cycle@parsepreamble\CF@remain@molecule\@nil% \begingroup inclus
+								\CF@cyclearcfalse
+								}%
+							\CF@cnt@cycle\z@
+							\edef\CF@hook@cycle{\CF@bond@outnode}%
+							\let\CF@hook@atomgroup\CF@previous@atomgroup
+							\CF@incycletrue
+							\ifnum\CF@last@action=\thr@@
+								\pgfmathparse{360/\CF@lastcycle@num-180}% c'est un cycle dans un cycle
+							\else
+								\pgfmathparse{-180/\CF@cycle@num-90+\CF@cycle@anglecorrection}%
+							\fi
+							\let\CF@initcycle@angle\pgfmathresult
+							\ifCF@cyclearc% on doit tracer l'arc de cercle dans le cycle ?
+								\pgfmathparse{\CF@cycle@inraduiscoeff*\CF@current@length*\CF@atom@sep/(2*tan(180/\CF@cycle@num))}%
+								\let\CF@cyclearc@radius\pgfmathresult
+								\pgfmathparse{\CF@current@angle+\CF@initcycle@angle+180/\CF@cycle@num+90}
+								\let\CF@cyclearc@initangle\pgfmathresult
+								\pgfmathparse{\CF@current@length*\CF@atom@sep/(2*sin(180/\CF@cycle@num))}%
+								\node[at=(\CF@bond@outnode),shift=(\CF@cyclearc@initangle:\pgfmathresult pt)](arccenter){};% le centre de l'arc
+								\node[at=(arccenter),shift=(\CF@cyclearc@startangle:\CF@cyclearc@radius pt)](initarc){};% le d\'ebut de l'arc
+								\expandafter\draw\expandafter[\CF@cyclearc@directtikz](initarc) arc (\CF@cyclearc@startangle:\CF@cyclearc@endangle:\CF@cyclearc@radius pt);
+							\fi
+							\aftergroup\CF@chemfig@v
+							\def\CF@next@action{\expandafter\CF@chemfig@iv\expandafter{\CF@sub@mol}}%
+						\fi
+						}%
+						{\errmessage{Package \CF@package@name\space Error: something went wrong at this point: \detokenize\expandafter{\CF@remain@molecule}^^JIf you think it's a bug, please, send a Minimal Example to the author.}}%
+					\fi}%
+				}%
+		\else
+			\CF@expand@second{\CF@expand@second{\CF@expand@second\CF@draw@atomgroup\CF@current@angle}\CF@current@toatom}\CF@current@atomgroup
+		\fi
+	\fi
+	\CF@next@action
+}
+
+\CF@def\CF@cycle@parsepreamble*#1#2\@nil{%
+	\ifnum#1<\thr@@
+		\errmessage{Package \CF@package@name\space Error: A cycle must be at least a triangle.^^JThe number following "*" must be 3 or more}%
+	\fi
+	\def\CF@remain@molecule{#2}%
+	\expandafter\CF@grab@submol\expandafter{\CF@remain@molecule}%
+	\begingroup
+	\def\CF@cycle@num{#1}%
+}
+
+\CF@def\CF@cycle@parsepreamblewithoptarg*[#1]#2#3\@nil{%
+	\CF@cycle@parseoptarg#1,\@empty,\@empty,\@empty\@nil
+	\CF@cycle@parsepreamble*#2#3\@nil
+}
+
+\CF@def\CF@cycle@parseoptarg#1,#2,#3\@nil{%
+	\ifx\@empty#1\@empty\def\CF@cyclearc@startangle{0}\else\def\CF@cyclearc@startangle{#1}\fi
+	\ifx\@empty#2\@empty\def\CF@cyclearc@endangle{360}\else\def\CF@cyclearc@endangle{#2}\fi
+	\expandafter\def\expandafter\CF@cyclearc@directtikz\expandafter{\CF@sanitize@lastitem#3,\@empty\@nil}%
+}
+
+\CF@def\CF@grab@submol#1{%
+	\begingroup
+		\catcode`(\@ne\catcode`)\tw@
+		\expandafter\expandafter\expandafter
+	\endgroup
+	\expandafter\CF@grab@submol@i\scantokens{\relax#1}% le \relax sert \`a meubler pour ne pas que l'argument d\'elimit\'e n'enl\`eve les accolades
+}
+
+\CF@def\CF@grab@submol@i#1\@nil{%
+	\expandafter\assign@tonil\expandafter\CF@remain@molecule\scantokens\expandafter\expandafter\expandafter{\expandafter\@gobble\@gobble#1}%
+	\expandafter\assign@tonil\expandafter\CF@sub@mol\scantokens\expandafter\expandafter\expandafter{\expandafter\@car\@gobble#1\@nil}%
+}
+
+\CF@def\assign@tonil#1#2\@nil{\def#1{#2}}
+
+\CF@def\CF@ifcar@isupperletter#1{%
+	\ifcat\relax\noexpand#1%
+		\let\CF@next\@secondoftwo% faux si c'est une sc
+	\else
+		\ifnum`#1<`A
+			\let\CF@next\@secondoftwo
+		\else
+			\ifnum`#1>`Z
+				\let\CF@next\@secondoftwo
+			\else
+				\let\CF@next\@firstoftwo
+			\fi
+		\fi
+	\fi
+	\CF@next
+}
+
+% Cr\'e\'e 4 noeuds au dessus et au dessous des noeuds #1 et #2
+% \`a une distance de #3 du noeud #1 et #4 du noeud #2
+\CF@def\CF@create@normnodes#1#2#3#4{%
+	\ifx\@empty#3\@empty\else
+		\node[at=(#1),xshift=#3*\CF@norm@x,yshift=#3*\CF@norm@y](#11){};
+		\node[at=(#1),xshift=-#3*\CF@norm@x,yshift=-#3*\CF@norm@y](#12){};
+	\fi
+	\ifx\@empty#4\@empty\else
+		\node[at=(#2),xshift=#4*\CF@norm@x,yshift=#4*\CF@norm@y](#21){};
+		\node[at=(#2),xshift=-#4*\CF@norm@x,yshift=-#4*\CF@norm@y](#22){};
+	\fi
+}
+
+\CF@def\CF@compute@nodevect#1#2{%
+	\pgfextractx\CF@dim{\pgfpointanchor{#1}{center}}\edef\CF@dimax{\the\CF@dim}%
+	\pgfextracty\CF@dim{\pgfpointanchor{#1}{center}}\edef\CF@dimay{\the\CF@dim}%
+	\pgfextractx\CF@dim{\pgfpointanchor{#2}{center}}\edef\CF@dimbx{\the\CF@dim}%
+	\pgfextracty\CF@dim{\pgfpointanchor{#2}{center}}\edef\CF@dimby{\the\CF@dim}%
+	\pgfmathparse{veclen(\CF@dimbx-\CF@dimax,\CF@dimby-\CF@dimay)}\let\CF@len@vector\pgfmathresult
+	\pgfmathparse{(\CF@dimay-\CF@dimby)/\CF@len@vector}\let\CF@norm@x\pgfmathresult
+	\pgfmathparse{(\CF@dimbx-\CF@dimax)/\CF@len@vector}\let\CF@norm@y\pgfmathresult
+}
+
+\CF@def\CF@draw@bond#1#2#3#4#5{% #1=type de liaison #2 et #3:nom de noeuds de d\'ebut et fin #4 et #5: contenu des atomes de d\'ebut et fin
+	\edef\CF@start@offset{%
+		\ifx\CF@start@offset\@empty
+			\ifx#4\CF@empty@node0pt\else\ifx#4\@empty0pt\else\CF@bond@offset\fi\fi
+		\else
+			\CF@start@offset
+		\fi
+		}%
+	\edef\CF@end@offset{%
+		\ifx\CF@end@offset\@empty
+			\ifx#5\CF@empty@node0pt\else\ifx#5\@empty0pt\else\CF@bond@offset\fi\fi
+		\else
+			\CF@end@offset
+		\fi
+		}%
+	\path(#2)--(#3)coordinate[pos=0](#2@)coordinate[pos=1](#3@);%
+	\CF@compute@nodevect{#2@}{#3@}%
+	\pgfmathparse{\CF@start@offset/\CF@len@vector}\let\CF@start@coeff\pgfmathresult
+	\pgfmathparse{1-\CF@end@offset/\CF@len@vector}\let\CF@end@coeff\pgfmathresult
+	\path(#2@)--(#3@)coordinate[pos=\CF@start@coeff](#2@@)coordinate[pos=\CF@end@coeff](#3@@);%
+	\unless\ifx\CF@movebond@name\@empty% on doit poser un nœud sur la liaison
+		\path(#2@@)--(#3@@)coordinate[overlay,pos=\CF@movebond@coeff](\CF@movebond@name);
+		\let\CF@movebond@name\@empty
+	\fi
+	\ifcase#1\relax
+		\errmessage{Package \CF@package@name\space Error: unknown bond type, this error should not occur^^JIf you think it's a bug, send a Minimal Example to the author}%
+	\or% 1 = liaison simple
+		\CF@draw@bond@i(#2@@)--(#3@@);
+	\or% 2 = liaison double
+		\ifCF@incycle
+			\ifnum\CF@doublebond@type=\z@
+				\let\CF@doublebond@type\@ne
+			\fi
+			\pgfmathparse{\CF@double@sep*tan(180/\CF@cycle@num)}%
+			\let\CF@doublebond@lengthcorrection\pgfmathresult
+		\fi
+		\ifcase\CF@doublebond@type
+			\CF@create@normnodes{#2@@}{#3@@}{\CF@double@sep/2}{\CF@double@sep/2}%
+			\CF@draw@bond@i(#2@@1)--(#3@@1);
+			\CF@draw@bond@i(#2@@2)--(#3@@2);
+		\or
+			\CF@create@normnodes{#2@@}{#3@@}\CF@double@sep\CF@double@sep
+			\CF@draw@bond@i(#2@@)--(#3@@);
+			\begingroup% ajuste \'eventuellement les longueurs des liaisons doubles
+				\ifCF@incycle
+					\ifdim\CF@start@offset=\z@
+						\CF@add@tocs\CF@current@tikz{,shorten <=\CF@doublebond@lengthcorrection pt}%
+					\fi
+					\ifdim\CF@end@offset=\z@
+						\CF@add@tocs\CF@current@tikz{,shorten >=\CF@doublebond@lengthcorrection pt}%
+					\fi
+				\fi
+				\CF@draw@bond@i(#2@@1)--(#3@@1);
+			\endgroup
+		\or
+			\CF@create@normnodes{#2@@}{#3@@}\CF@double@sep\CF@double@sep
+			\CF@draw@bond@i(#2@@)--(#3@@);
+			\begingroup% ajuste \'eventuellement les longueurs des liaisons doubles
+				\ifCF@incycle
+					\ifdim\CF@start@offset=\z@
+						\CF@add@tocs\CF@current@tikz{,shorten <=-\CF@doublebond@lengthcorrection pt}%
+					\fi
+					\ifdim\CF@end@offset=\z@
+						\CF@add@tocs\CF@current@tikz{,shorten >=-\CF@doublebond@lengthcorrection pt}%
+					\fi
+				\fi
+				\CF@draw@bond@i(#2@@2)--(#3@@2);
+			\endgroup
+		\fi
+	\or% 3 = liaison triple
+		\CF@create@normnodes{#2@@}{#3@@}\CF@double@sep\CF@double@sep
+		\CF@draw@bond@i(#2@@)--(#3@@);
+		\CF@draw@bond@i(#2@@1)--(#3@@1);
+		\CF@draw@bond@i(#2@@2)--(#3@@2);
+	\or% 4 = liaison Cram pleine de #2 vers #3
+		\CF@create@normnodes{#2@@}{#3@@}{\CF@cram@basewidth/2}{}%
+		\expandafter\filldraw\expandafter[\CF@current@tikz,line join=bevel](#2@@1)--(#2@@2)--(#3@@)--(#2@@1);
+	\or% 5 = liaison Cram pleine de #3 vers #2
+		\CF@create@normnodes{#3@@}{#2@@}{\CF@cram@basewidth/2}{}%
+		\expandafter\filldraw\expandafter[\CF@current@tikz,line join=bevel](#3@@1)--(#3@@2)--(#2@@)--(#3@@1);
+	\or% 6 = liaison Cram pointill\'ee de #2 vers #3
+		\scope
+			\CF@create@normnodes{#2@@}{#3@@}{\CF@cram@basewidth/2}{}%
+			\clip(#2@@1)--(#2@@2)--(#3@@)--(#2@@1);
+			\expandafter\draw\expandafter[\CF@current@tikz,dash pattern=on \CF@cram@dashlength off \CF@cram@dashsep,line width=\CF@cram@basewidth](#2@@)--(#3@@);
+		\endscope
+	\or% 7 = liaison Cram pointill\'ee de #3 vers #2
+		\scope
+			\CF@create@normnodes{#3@@}{#2@@}{\CF@cram@basewidth/2}{}%
+			\clip(#3@@1)--(#3@@2)--(#2@@)--(#3@@1);
+			\expandafter\draw\expandafter[\CF@current@tikz,dash pattern=on \CF@cram@dashlength off \CF@cram@dashsep,line width=\CF@cram@basewidth](#3@@)--(#2@@);
+		\endscope
+	\or% 8 = liaison Cram triangle \'evid\'e de #2 vers #3
+		\CF@create@normnodes{#2@@}{#3@@}{\CF@cram@basewidth/2}{}%
+		\expandafter\draw\expandafter[\CF@current@tikz,line join=bevel](#2@@1)--(#2@@2)--(#3@@)--(#2@@1);
+	\or% 9 = liaison Cram triangle \'evid\'e de #3 vers #1
+		\CF@create@normnodes{#3@@}{#2@@}{\CF@cram@basewidth/2}{}%
+		\expandafter\draw\expandafter[\CF@current@tikz,line join=bevel](#3@@1)--(#3@@2)--(#2@@)--(#3@@1);
+	\else
+		\errmessage{Package \CF@package@name\space Error: unknown bond type, this error should not occur^^JIf you think it's a bug, send a Minimal Example to the author}%
+	\fi
+	\let\CF@start@offset\@empty
+	\let\CF@end@offset\@empty
+}
+
+\CF@def\CF@draw@bond@i{\expandafter\draw\expandafter[\CF@current@tikz]}
+
+\CF@def\CF@hook@drawall{% dessine tous les crochets contenus dansla sc \CF@hook@draw
+	\unless\ifx\CF@hook@drawlist\@empty
+		\expandafter\CF@hook@drawfirst\CF@hook@drawlist\@nil% trace un lien de crochet \`a crochet
+		\expandafter\CF@hook@drawall
+	\fi
+}
+
+\CF@def\CF@hook@drawfirst[#1,#2,#3]#4#5#6#7#8\@nil{%
+	\def\CF@hook@drawlist{#8}%
+	\begingroup
+		\def\CF@current@tikz{#3}%
+		\def\CF@hook@startcontent{#6}\def\CF@hook@endcontent{#7}%
+		\CF@if@integer{#2}%
+			{\CF@draw@bond{#2}{#4}{#5}\CF@hook@startcontent\CF@hook@endcontent}%
+			{\CF@bond@findnum{#2}\CF@bond@currentnum
+			\CF@draw@bond\CF@bond@currentnum{#4}{#5}\CF@hook@startcontent\CF@hook@endcontent
+			}%
+	\endgroup
+}
+
+\CF@def\CF@extract@atom#1-#2\@nil{#2}% transforme le bound@outnode en n° de l'atome
+
+\CF@def\setnodestyle{\def\CF@node@style}
+\setnodestyle{}
+
+\expandafter\CF@def\expandafter\CF@gobble@movearg\string @#1#2\@nil#3%
+{%
+	\expandafter\def\csname atom@\number\CF@cnt@atomnumber\endcsname{#2}%
+	\CF@if@instr{#1},%
+		{\CF@analyse@movearg#1\@nil#3\let\CF@movebond@coeff\@empty}%
+		{\def#3{#1}}%
+	\ifx\@empty#2\@empty\let\CF@node@strut\@empty\fi
+}%
+
+\CF@def\hflipnext{\let\CF@split@state\@ne}
+
+\CF@def\vflipnext{\let\CF@split@state\tw@}
+\let\CF@split@state\z@
+
+\CF@def\CF@draw@atomgroup#1#2#3{% #1=angle d'arriv\'ee de la liaison #2=numero atome sur lequel arrive la liaison #3=groupe d'atomes
+	\expandafter\let\expandafter\CF@bond@outcontent% assigne le contenu de l'atome d'o\`u part la liaison
+		\csname
+			\ifdefined\CF@bond@outnode
+				atom@\expandafter\CF@extract@atom\CF@bond@outnode\@nil
+			\else
+				@empty%
+			\fi
+		\endcsname
+	\global\advance\CF@cnt@groupnumber\@ne
+	\let\CF@current@atom\@empty
+	\global\let\CF@hook@drawlist\@empty
+	\CF@cnt@atomingroup\z@
+	\CF@if@firsttokmatch{#3}?{\CF@draw@atomgroup@i{{}#3}}{\CF@draw@atomgroup@i{#3}}%
+	\def\CF@current@atomgroup{#3}%
+	\CF@remove@movearg\CF@current@atomgroup% enl\`eve les "@{<nom>}"
+	\CF@if@instr{#3}?%
+		{\CF@remove@hook\CF@current@atomgroup
+		\ifx\@empty\CF@current@atomgroup\let\CF@current@atomgroup\CF@empty@node\fi}%
+		\relax
+	\ifx\@empty#2\@empty%
+	\else
+		\ifnum#2<\@ne
+			\immediate\write\CF@unused{Package \CF@package@name\space Warning: no atom found at position #2.^^JPershaps you mispelled the optional argument of the bond on input line \the\inputlineno.}%
+		\else
+			\ifnum#2>\CF@cnt@atomingroup
+				\errmessage{Package \CF@package@name\space Error: no atom found at position #2, pershaps you mispelled the optional argument of the bond.}%
+			\fi
+		\fi
+	\fi
+	\edef\CF@hook@atomnumber{%
+		\ifx\@empty#2\@empty%\relax
+			\ifdim#1pt>90pt
+				\ifdim#1pt<270pt \number\CF@cnt@atomingroup\else1\fi
+			\else1%
+			\fi
+		\else#2%
+		\fi}%
+	\CF@cnt@atomnumber\CF@hook@atomnumber
+	\ifx\CF@current@atomgroup\CF@empty@node
+		\let\CF@node@strut\@empty
+	\else
+		\ifx\@empty\CF@bond@outcontentsaved
+			\def\CF@node@strut{\vphantom\CF@bond@outcontent}%
+		\else
+			\def\CF@node@strut{\vphantom\CF@bond@outcontentsaved}%
+		\fi
+	\fi
+	\edef\CF@opt@string{anchor=\ifnum\CF@last@action=\z@ base\else center\fi,at=(CF@node),\CF@node@style}% premier atome de la mol\'ecule affich\'e
+	\loop
+		\unless\ifnum\CF@cnt@atomnumber>\CF@cnt@atomingroup
+		\expandafter\expandafter\expandafter\futurelet\expandafter\expandafter\expandafter\CF@toks@a\expandafter\expandafter\expandafter
+			\CF@gobble@tonil\csname atom@\number\CF@cnt@atomnumber\endcsname\@nil
+		\expandafter\ifx\string @\CF@toks@a% l'atome courant commence par un "@"
+			\expandafter\expandafter\expandafter\CF@gobble@movearg\csname atom@\number\CF@cnt@atomnumber\endcsname\@nil\CF@moveatom@name
+			\expandafter\node\expandafter[\CF@opt@string,overlay](\CF@moveatom@name){\phantom{\CF@node@content}};%
+			\let\CF@moveatom@name\@empty
+		\fi
+		\expandafter\node\expandafter[\CF@opt@string](n\number\CF@cnt@groupnumber-\number\CF@cnt@atomnumber){\CF@node@content};%
+		\let\CF@node@strut\@empty
+		\advance\CF@cnt@atomnumber\@ne
+		\edef\CF@opt@string{anchor=base \ifnum\CF@split@state=\@ne east\else west\fi,at=(n\number\CF@cnt@groupnumber-\number\numexpr\CF@cnt@atomnumber-1.base \ifnum\CF@split@state=\@ne west\else east\fi),\CF@node@style}%
+	\repeat
+	\CF@cnt@atomnumber\CF@hook@atomnumber
+	\ifnum\CF@last@action=\tw@% s'il faut tracer une liaison
+		\gdef\CF@cycle@anglecorrection{0}% alors c'est qu'un cycle ne peut pas commencer la mol\'ecule : annulation de la correction d'angle
+		\CF@draw@bond\CF@bond@type{\CF@bond@outnode}{n\number\CF@cnt@groupnumber-\number\CF@cnt@atomnumber}\CF@previous@atomgroup\CF@current@atomgroup
+	\fi
+	\let\CF@last@action\@ne% met la derni\`ere action \`a 1 : affichage d'un noeud
+	\loop
+		\ifnum\CF@cnt@atomnumber>\@ne
+		\advance\CF@cnt@atomnumber\m@ne
+		\edef\CF@opt@string{anchor=base \ifnum\CF@split@state=\@ne west\else east\fi,at=(n\number\CF@cnt@groupnumber-\number\numexpr\CF@cnt@atomnumber+1.base \ifnum\CF@split@state=\@ne east\else west\fi),\CF@node@style}%
+		\expandafter\expandafter\expandafter\futurelet\expandafter\expandafter\expandafter\CF@toks@a\expandafter\expandafter\expandafter
+			\CF@gobble@tonil\csname atom@\number\CF@cnt@atomnumber\endcsname\@nil
+		\expandafter\ifx\string @\CF@toks@a% l'atome courant commence par un "@"
+			\expandafter\expandafter\expandafter\CF@gobble@movearg\csname atom@\number\CF@cnt@atomnumber\endcsname\@nil\CF@moveatom@name
+			\expandafter\node\expandafter[\CF@opt@string,overlay](\CF@moveatom@name){\phantom{\CF@node@content}};%
+			\let\CF@moveatom@name\@empty
+		\fi
+		\expandafter\node\expandafter[\CF@opt@string](n\number\CF@cnt@groupnumber-\number\CF@cnt@atomnumber){\CF@node@content};%
+	\repeat
+	\CF@hook@drawall
+	\edef\CF@last@groupnumber{\number\CF@cnt@groupnumber}%
+	\let\CF@previous@atomgroup\CF@current@atomgroup
+}
+
+\expandafter\CF@def\expandafter\CF@keep@movearg\string @#1#2\@nil{\expandafter\def\expandafter\CF@current@atom\expandafter{\string @{#1}}}
+
+\CF@def\CF@draw@atomgroup@i#1{% transforme #1 en un groupe d'atomes
+	\ifx\@empty#1\@empty
+		\expandafter\let\csname atom@\number\CF@cnt@atomingroup\endcsname\CF@current@atom
+	\else
+		\advance\CF@cnt@atomingroup\@ne
+		\futurelet\CF@toks@a\CF@gobble@tonil#1\@nil
+		\expandafter\ifx\string @\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+			{\CF@keep@movearg#1\@nil
+			\CF@swap@fi
+			\CF@remove@movearg@i#1\@nil\CF@after@movearg
+			\expandafter\CF@draw@atomgroup@ii\expandafter{\CF@after@movearg}%
+			}%
+			{\CF@swap@fi
+			\let\CF@current@atom\@empty
+			\CF@draw@atomgroup@ii{#1}%
+			}%
+	\fi
+}
+
+\CF@def\CF@draw@atomgroup@ii#1{%
+	\ifx\@empty#1\@empty
+		\expandafter\let\csname atom@\number\CF@cnt@atomingroup\endcsname\CF@current@atom
+	\else
+	\futurelet\CF@toks@a\CF@gobble@tonil#1\@nil
+	\ifx\bgroup\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+		{\CF@expadd@tocs\CF@current@atom{\expandafter{\@car#1\@nil}}%
+		\expandafter\CF@draw@atomgroup@iii\expandafter{\@gobble#1}%
+		}%
+		{\ifx\@sptoken\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+			{\CF@add@tocs\CF@current@atom{ }%
+			\expandafter\CF@draw@atomgroup@iii\expandafter{\CF@after@space#1\@nil}%
+			}%
+			{\CF@expadd@tocs\CF@current@atom{\@car#1\@nil}%
+			\expandafter\CF@draw@atomgroup@iii\expandafter{\@gobble#1}%
+			}%
+		}%
+	\fi
+}
+
+% enl\`eve tous les "@{nom}" de la sc #1
+\CF@def\CF@remove@movearg#1{%
+	\CF@expand@afterfirst{\expandafter\CF@if@instr\expandafter{#1}}{\string @}%
+		{\expandafter\CF@remove@movearg@i#1\@nil#1%
+		\CF@remove@movearg#1}%
+		\relax
+}
+
+% enl\`eve le premier "@{<nom>}" de l'argument et l'assigne \`a #2
+\CF@def\CF@remove@movearg@i#1\@nil#2{%
+	\expandafter\def\expandafter\CF@remove@movearg@ii\expandafter##\expandafter1\string @{%
+		\expandafter\def\expandafter#2\expandafter{\@gobble##1}% mange le \relax
+		\CF@remove@movearg@iii\relax
+	}%
+	\def\CF@remove@movearg@iii##1\@nil{\CF@expadd@tocs#2{\@gobbletwo##1}}% mange le \relax et le <nom>
+	\CF@remove@movearg@ii\relax#1\@nil
+}
+
+\CF@def\CF@draw@atomgroup@iii#1{% transforme #1 en un groupe d'atomes
+	\ifx\@empty#1\@empty%
+		\expandafter\let\csname atom@\number\CF@cnt@atomingroup\endcsname\CF@current@atom
+		\let\CF@current@atom\@empty
+	\else
+		\futurelet\CF@toks@a\CF@gobble@tonil#1\@nil
+		\expandafter\ifx\string @\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+			{\expandafter\let\csname atom@\number\CF@cnt@atomingroup\endcsname\CF@current@atom
+			\let\CF@current@atom\@empty
+			\CF@swap@fi\CF@draw@atomgroup@i{#1}%
+			}%
+			{\ifx|\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+				{\expandafter\let\csname atom@\number\CF@cnt@atomingroup\endcsname\CF@current@atom
+				\let\CF@current@atom\@empty
+				\CF@swap@fi\expandafter\CF@draw@atomgroup@i\expandafter{\@gobble#1}%
+				}%
+				{\ifx\@sptoken\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+					{\CF@add@tocs\CF@current@atom{ }%
+					\CF@swap@fi\expandafter\CF@draw@atomgroup@iii\expandafter{\CF@after@space#1\@nil}%
+					 }%
+					{\ifx\bgroup\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+						{\CF@expadd@tocs\CF@current@atom{\expandafter{\@car#1\@nil}}%
+						\CF@swap@fi\expandafter\CF@draw@atomgroup@iii\expandafter{\@gobble#1}%
+						}%
+						{\expandafter\CF@ifcar@isupperletter\expandafter{\@car#1\@nil}%
+							{\expandafter\let\csname atom@\number\CF@cnt@atomingroup\endcsname\CF@current@atom
+							\let\CF@current@atom\@empty
+							\CF@swap@fi\CF@draw@atomgroup@i{#1}%
+							}%
+							{\ifx?\CF@toks@a\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+								{\expandafter\CF@if@firsttokmatch\expandafter{\@gobble#1}[% un crochet apr\`es le "?"
+									{\expandafter\CF@grab@optarg\@gobble#1\@nil\CF@after@hook}%
+									{\expandafter\CF@grab@optarg\expandafter[\expandafter]\@gobble#1\@nil\CF@after@hook}%
+									\CF@expand@second{\CF@expand@second\CF@if@instr\CF@hook@list}{\expandafter(\CF@hook@currentname)}% crochet d\'ej\`a d\'efini ?
+									{\expandafter\CF@hook@parselist\expandafter{\CF@hook@currentname}% va chercher les caract\'eristiques du crochet sauvegard\'e
+									\CF@edefadd@tocs\CF@hook@drawlist{%
+										[\CF@hook@currentname,\CF@hook@currentlink,\CF@hook@currenttikz]{\CF@hook@savedcoord}{n\number\CF@cnt@groupnumber-\number\CF@cnt@atomingroup}}%
+									\CF@expadd@tocs\CF@hook@drawlist{\expandafter{\CF@hook@savedcontent}}%
+									\CF@expadd@tocs\CF@hook@drawlist{\expandafter{\CF@current@atom}}% ajoute les 4 arguments \`a la liste des crochets \`a tracer
+									\global\let\CF@hook@drawlist\CF@hook@drawlist
+									}%
+									{\CF@edefadd@tocs\CF@hook@list{(\CF@hook@currentname)|n\number\CF@cnt@groupnumber-\number\CF@cnt@atomingroup|}%
+									\CF@expadd@tocs\CF@hook@list{\CF@current@atom|}%
+									\global\let\CF@hook@list\CF@hook@list
+									}%
+								\CF@swap@fi\expandafter\CF@draw@atomgroup@iii\expandafter{\CF@after@hook}%
+								}%
+								{\CF@expadd@tocs\CF@current@atom{\@car#1\@nil}%
+								\CF@swap@fi\expandafter\CF@draw@atomgroup@iii\expandafter{\@gobble#1}%
+								}%
+							}%
+						}%
+					}%
+				}%
+			}%
+	\fi
+}
+
+\CF@def\CF@kook@defaultname{a}
+\CF@def\CF@hook@defaultlink{-}
+\CF@def\CF@hook@defaulttikz{}
+
+\CF@def\CF@hook@parseoptarg#1,#2,#3\@nil{%
+	\CF@testempty@andassign\CF@hook@currentname{#1}\CF@kook@defaultname
+	\CF@testempty@andassign\CF@hook@currentlink{#2}\CF@hook@defaultlink
+	\CF@testempty@andassign\CF@hook@currenttikz{#3}\CF@hook@defaulttikz
+}
+
+\CF@def\CF@grab@optarg[#1]#2\@nil#3{%
+	\CF@hook@parseoptarg#1,,\@nil
+	\def#3{#2}%
+}
+
+\CF@def\CF@hook@parselist#1{% #1 est le nom du noeud \`a retrouver
+	\def\CF@hook@parselist@i##1(#1)|##2|##3|##4\@nil{%
+		\def\CF@hook@savedcoord{##2}\def\CF@hook@savedcontent{##3}%
+	}%
+	\expandafter\CF@hook@parselist@i\CF@hook@list\@nil
+}
+
+\CF@def\CF@remove@hook#1{% enl\`eve tous les crochets (et leurs arguments optionnels) de la sc #1
+	\expandafter\CF@if@instr\expandafter{#1}{?[}%
+		{\expandafter\expandafter\expandafter\def\expandafter\expandafter\expandafter#1%
+			\expandafter\expandafter\expandafter{\expandafter\CF@remove@opthook#1\@nil}%
+		\CF@remove@hook#1%
+		}%
+		{\CF@remove@hook@i#1}%
+}
+
+\CF@def\CF@remove@hook@i#1{%
+	\expandafter\CF@if@instr\expandafter{#1}?%
+		{\expandafter\expandafter\expandafter\def\expandafter\expandafter\expandafter#1%
+			\expandafter\expandafter\expandafter{\expandafter\CF@remove@singlehook#1\@nil}%
+		\CF@remove@hook@i#1%
+		}%
+		\relax
+}
+
+\CF@def\CF@remove@opthook#1?[#2]#3\@nil{#1#3}
+
+\CF@def\CF@remove@singlehook#1?#2\@nil{#1#2}
+
+\CF@def\setlewis{\@testopt\CF@setlewis{0.3ex}}
+
+\CF@def\CF@setlewis[#1]#2#3#4{%
+	\def\CF@lewis@widthdouble{#1}%
+	\ifx\@empty#2\@empty\def\CF@lewis@offset{0.4ex}\else\def\CF@lewis@offset{#2}\fi
+	\ifx\@empty#3\@empty\def\CF@lewis@length{1.5ex}\else\def\CF@lewis@length{#3}\fi
+	\ifx\@empty#4\@empty\def\CF@lewis@style{}\else\def\CF@lewis@style{#4}\fi
+}
+
+\setlewis{}{}{}
+
+\CF@def\lewis{\begingroup\@makeother;\@makeother:\CF@lewis@i}
+
+\CF@def\CF@lewis@i#1{\CF@lewis@ii#1\@nil}
+
+\CF@def\CF@lewis@ii#1,#2\@nil{%
+	\setbox\CF@lewis@box\hbox{\printatom{#2}}%
+	\def\CF@lewis@remainpos{#1}%
+	\let\CF@lewis@previouspos\@empty
+	\loop
+		\unless\ifx\CF@lewis@remainpos\@empty
+			\edef\CF@lewis@currentpos{\expandafter\@car\CF@lewis@remainpos\@nil}%
+			\edef\CF@lewis@remainpos{\expandafter\@gobble\CF@lewis@remainpos}%
+			\pgfmathparse{\wd\CF@lewis@box/2+\ifcase\CF@lewis@currentpos\space1\or1\or0\or-1\or-1\or-1\or0\or1\fi*(\wd\CF@lewis@box/2+\CF@lewis@offset)}%
+			\let\CF@lewis@x\pgfmathresult
+			\pgfmathparse{\ht\CF@lewis@box/2+\ifcase\CF@lewis@currentpos\space0\or1\or1\or1\or0\or-1\or-1\or-1\fi*(\ht\CF@lewis@box/2\ifnum\CF@lewis@currentpos>4 +\dp\CF@lewis@box\fi+\CF@lewis@offset)}%
+			\let\CF@lewis@y\pgfmathresult
+			\edef\CF@lewis@xoffset{\ifcase\CF@lewis@currentpos\space
+				0\or0.70711\or1\or0.70711\or0\or-0.70711\or-1\or-0.70711\fi}%
+			\edef\CF@lewis@yoffset{\ifcase\CF@lewis@currentpos\space
+				-1\or-0.70711\or0\or0.70711\or1\or0.70711\or0\or-0.70711\fi}%
+			\pgfmathparse{veclen(\CF@lewis@xoffset,\CF@lewis@yoffset)}\let\CF@len@normvec\pgfmathresult
+			\edef\CF@lewis@diagmul{\ifcase\CF@lewis@currentpos\space1\or0\or1\or0\or1\or0\or1\or0\fi}% annule l'offset pour les diagonales
+			\if.\expandafter\@car\CF@lewis@remainpos\relax\@nil
+				\edef\CF@lewis@remainpos{\expandafter\@gobble\CF@lewis@remainpos}%
+				\tikz \draw[overlay,fill,black]
+					(\CF@lewis@x pt-\CF@lewis@yoffset*\CF@lewis@diagmul*0.1ex,
+					\CF@lewis@y pt+\CF@lewis@xoffset*\CF@lewis@diagmul*0.1ex)circle(0.15ex);%
+			\else
+				\if|\expandafter\@car\CF@lewis@remainpos\relax\@nil
+					\edef\CF@lewis@remainpos{\expandafter\@gobble\CF@lewis@remainpos}%
+					\expandafter\tikz\expandafter\draw\expandafter[\CF@lewis@style,overlay]%
+						(\CF@lewis@x-\CF@lewis@length*\CF@lewis@xoffset/2 pt,\CF@lewis@y-\CF@lewis@length*\CF@lewis@yoffset/2 pt)--
+						([xshift=-\CF@lewis@yoffset*\CF@lewis@widthdouble,yshift=\CF@lewis@xoffset*\CF@lewis@widthdouble]\CF@lewis@x-\CF@lewis@xoffset*\CF@lewis@length/2 pt,\CF@lewis@y-\CF@lewis@yoffset*\CF@lewis@length/2 pt)--
+						([xshift=-\CF@lewis@yoffset*\CF@lewis@widthdouble,yshift=\CF@lewis@xoffset*\CF@lewis@widthdouble]\CF@lewis@x+\CF@lewis@length*\CF@lewis@xoffset/2 pt,\CF@lewis@y+\CF@lewis@length*\CF@lewis@yoffset/2 pt)--
+						(\CF@lewis@x+\CF@lewis@length*\CF@lewis@xoffset/2 pt,\CF@lewis@y+\CF@lewis@length*\CF@lewis@yoffset/2 pt)--cycle;%
+				\else
+					\if:\expandafter\@car\CF@lewis@remainpos\relax\@nil
+						\edef\CF@lewis@remainpos{\expandafter\@gobble\CF@lewis@remainpos}%
+						\tikz \draw[overlay,fill,black]
+							(\CF@lewis@x pt-\CF@lewis@yoffset*\CF@lewis@diagmul*0.2ex-.2em*\CF@lewis@xoffset/\CF@len@normvec,\CF@lewis@y pt+\CF@lewis@xoffset*\CF@lewis@diagmul*0.2ex-.2em*\CF@lewis@yoffset/\CF@len@normvec)circle(0.15ex)%
+							(\CF@lewis@x pt-\CF@lewis@yoffset*\CF@lewis@diagmul*0.2ex+.2em*\CF@lewis@xoffset/\CF@len@normvec,\CF@lewis@y pt+\CF@lewis@xoffset*\CF@lewis@diagmul*0.2ex+.2em*\CF@lewis@yoffset/\CF@len@normvec)circle(0.15ex);%
+					\else
+						\expandafter\tikz\expandafter\draw\expandafter[\CF@lewis@style,overlay]%
+							(\CF@lewis@x-\CF@lewis@length*\CF@lewis@xoffset/2 pt,\CF@lewis@y-\CF@lewis@length*\CF@lewis@yoffset/2 pt)--%
+							(\CF@lewis@x+\CF@lewis@length*\CF@lewis@xoffset/2 pt,\CF@lewis@y+\CF@lewis@length*\CF@lewis@yoffset/2 pt);%
+					\fi
+				\fi
+		\fi
+	\repeat
+	\box\CF@lewis@box
+	\endgroup
+}
+
+\CF@def\chembelow{\CF@save@catcode\CF@sanitize@catcode\@testopt\CF@chembelow{1.5pt}}
+
+\CF@def\CF@chembelow[#1]#2#3{%
+	\setbox\CF@box@boxa\hbox{\printatom{#2}}\setbox\CF@box@boxb\hbox{\printatom{#3}}%
+	\vtop{%
+		\hbox{\printatom{#2}}%
+		\hrule width0pt depth0pt height#1\relax
+		\hbox{%
+			\hskip\dimexpr(\wd\CF@box@boxa-\wd\CF@box@boxb)/\tw@
+			\printatom{#3}%
+			\hskip\dimexpr(\wd\CF@box@boxa-\wd\CF@box@boxb)/\tw@
+			}%
+			\vskip-\dimexpr\ht\CF@box@boxb+\dp\CF@box@boxb+#1\relax
+		}%
+	\CF@restore@catcode
+}
+
+\CF@def\chemabove{\CF@save@catcode\CF@sanitize@catcode\@testopt\CF@chemabove{1.5pt}}
+
+\CF@def\CF@chemabove[#1]#2#3{%
+	\setbox\CF@box@boxa\hbox{\printatom{#2}}\setbox\CF@box@boxb\hbox{\printatom{#3}}%
+	\vtop{%
+		\hbox{\printatom{#2}}%
+		\hrule width0pt depth0pt height-\dimexpr#1+\ht\CF@box@boxa+\ht\CF@box@boxb+\dp\CF@box@boxb\relax
+		\hbox{%
+			\hskip\dimexpr(\wd\CF@box@boxa-\wd\CF@box@boxb)/\tw@
+			\printatom{#3}%
+			\hskip\dimexpr(\wd\CF@box@boxa-\wd\CF@box@boxb)/\tw@
+			}%
+		}%
+	\CF@restore@catcode
+}
+
+%%%%%% les signes et les fl\`eches
+\CF@def\chemsign{\@testopt\CF@chemsign{0.5em}}
+
+\CF@def\CF@chemsign[#1]#2{\hbox{\kern#1\relax#2\kern#1}}
+
+\CF@def\setchemrel#1#2#3{%
+	\ifx\@empty#1\@empty\def\CF@chemrel@vsep{2pt}\else\def\CF@chemrel@vsep{#1}\fi
+	\ifx\@empty#2\@empty\def\CF@chemrel@hsep{0.7em}\else\def\CF@chemrel@hsep{#2}\fi
+	\ifx\@empty#3\@empty\def\CF@chemrel@length{4em}\else\def\CF@chemrel@length{#3}\fi
+}
+
+\setchemrel{}{}{}
+
+\CF@def\chemrel{\CF@save@catcode\CF@sanitize@catcode\@testopt\CF@chemchemrel@i{}}
+
+\CF@def\CF@chemchemrel@i[#1]{\@testopt{\CF@chemchemrel@ii[#1]}{}}
+
+\CF@def\CF@chemchemrel@ii[#1][#2]#3{%
+	\def\CF@chemrel@stuff
+		{\leavevmode\kern\CF@chemrel@hsep
+		\tikzpicture[every node/.style={anchor=base,inner sep=0pt,outer sep=0pt,minimum size=0pt},baseline]%
+			\CF@if@instr{#3}{<>}%
+				{\node[yshift=-1pt] at(0,0)(chemrel@start){\vphantom I};\node[yshift=-1pt] at(\CF@chemrel@length,0)(chemrel@end){\vphantom I};%
+				\expandafter\draw\expandafter[\CF@remove@equichars#3,\@nil-](chemrel@end)--(chemrel@start);\fill (chemrel@start)--++(4pt,-1.75pt)--+(-1.5pt,1.75pt)--cycle;%
+				\node[yshift=1pt] at(0,0)(chemrel@start){\vphantom I};\node[yshift=1pt] at(\CF@chemrel@length,0)(chemrel@end){\vphantom I};%
+				\expandafter\draw\expandafter[\CF@remove@equichars#3,\@nil-](chemrel@start)--(chemrel@end);\fill(chemrel@end)--++(-4pt,1.75pt)--+(1.5pt,-1.75pt)--cycle;
+				}%
+				{\node at(0,0)(chemrel@start){\vphantom I};\node at(\CF@chemrel@length,0)(chemrel@end){\vphantom I};%
+				\draw[#3](chemrel@start)--(chemrel@end);%
+				}%
+		\endtikzpicture
+		\kern\CF@chemrel@hsep
+		}%
+	\ifx\@empty#1\@empty
+		\ifx\@empty#2\@empty\CF@chemrel@stuff
+		\else\chembelow[\CF@chemrel@vsep]\CF@chemrel@stuff{\hbox{#2}}%
+		\fi
+	\else
+		\ifx\@empty#2\@empty\chemabove[\CF@chemrel@vsep]\CF@chemrel@stuff{\hbox{#1}}%
+		\else\chemabove[\CF@chemrel@vsep]{\chembelow[\CF@chemrel@vsep]\CF@chemrel@stuff{\hbox{#2}}}{\hbox{#1}}%
+		\fi
+	\fi
+	\CF@restore@catcode
+}
+
+\CF@def\CF@remove@equichars#1<>#2\@nil{#1#2}
+
+\CF@def\chemmove{\CF@save@catcode\CF@sanitize@catcode\@testopt\CF@chemmove{}}
+
+\CF@def\CF@chemmove[#1]#2{%
+	\ifx\@empty#2\@empty
+		\expandafter\@gobble
+	\else
+		\expandafter\@firstofone
+	\fi
+	{\expandafter\tikzpicture\romannumeral\ifx\@empty#1\@empty\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi
+		{\z@[remember picture,overlay]}{\z@[remember picture,overlay,#1]}#2
+		\endtikzpicture
+	}%
+	\CF@restore@catcode
+}
+
+\CF@def\chemnameinit#1{%
+	\CF@save@catcode\CF@sanitize@catcode
+	\setbox\CF@stuff@box\hbox{#1}%
+	\edef\CF@dp@max{\the\dp\CF@stuff@box}%
+	\CF@restore@catcode
+}
+\chemnameinit{}
+
+\CF@def\CF@parse@molname#1\\#2\@nil{%
+	\hbox to\CF@wd@stuffbox{\hss#1\hss}%
+	\ifx\@empty#2\@empty
+	\else
+		\CF@swap@fi
+		\CF@parse@molname#2\@nil
+	\fi
+}
+
+\CF@def\chemname{\CF@save@catcode\CF@sanitize@catcode\@testopt\CF@chemname{1.5ex}}
+
+\CF@def\CF@chemname[#1]#2#3{%
+	\setbox\CF@stuff@box\hbox{#2}%
+	\edef\CF@wd@stuffbox{\the\wd\CF@stuff@box}\edef\CF@dp@stuffbox{\the\dp\CF@stuff@box}%
+	\leavevmode
+	\ifdim\CF@dp@max<\CF@dp@stuffbox\let\CF@dp@max\CF@dp@stuffbox\fi
+	\vtop{%
+		\box\CF@stuff@box
+		\nointerlineskip
+		\kern\dimexpr#1+\CF@dp@max-\CF@dp@stuffbox\relax
+		\CF@parse@molname#3\\\@nil
+	}%
+	\CF@restore@catcode
+}
+
+\CF@savedcatcode
+
+\endinput
+
+######################################################################
+#                             Historique                             #
+######################################################################
+
+v0.1        2010/06/23
+	- Premi\`ere version publique sur le CTAN
+----------------------------------------------------------------------
+v0.2        2010/08/31
+	- Ajout de la documentation en anglais.
+	- Correction de bugs.
+	- \printatom est d\'esormais une macro publique.
+	- Les espaces sont permis dans les mol\'ecules. Ils seront
+	  ignor\'es par d\'efaut puisque les atomes sont compos\'es en
+	  mode math par \printatom
+	- Une paire de Lewis peut être repr\'esent\'ee ":".
+	- Dans les cycles, une correction de la longueur du trait
+	  d\'eport\'e des liaisons doubles est fait de telle sorte que si
+	  l'on \'ecrit \chemfig{*5(=====)}, on obtient deux polygones
+	  r\'eguliers concentriques.
+	- La s\'equence de contr\^ole \setnodestyle permet de sp\'ecifier
+	  le style des nœuds dessin\'es par tikz.
+----------------------------------------------------------------------
+v0.3        2010/11/21
+	- Am\'elioration de \definesubmol qui accepte les s\'equences de
+	  contr\^ole. On peut aussi choisir un alias dont la substitution
+	  est diff\'erente selon l'orientation de la liaison qui lui
+	  arrive dessus.
+	- Le caract\`ere "|" force la fin d'un atome. Si on \'ecrit
+	  "D|ef" alors, chemfig verra deux atomes "D" et "ef".
+	- Le caract\`ere "#" est reconnu lorsqu'il suit un caract\`ere de
+	  liaison. Il doit être suivi d'un argument entre parenth\`eses
+	  qui contient l'offset de d\'ebut et de fin qui s'appliqueront
+	  \`a cette liaison.
+	- La macro \chemfig admet un argument optionnel qui sera pass\'e
+	  \`a l'environnement tikzpicture dans lequel elle est dessin\'ee
+	- Mise en place de la repr\'esentation des m\'ecanismes
+	  r\'eactionnels avec la synatxe "@{<nom>}" devant un atome o\`u
+	  "@{<nom>,<coeff>}" au tout d\'ebut de l'argument d'une liaison.
+	  Cette syntaxe permet de placer un nœud (au sens de tikz) qui
+	  deviendra l'extr\'emit\'e des fl\`eches des m\'ecanismes.
+	  Le trac\'e des fl\`eches est faite par la macro \chemmove dont
+	  l'argument optionnel devient celui de l'environnement
+	  tikspicture dans lequel sont faites les fl\`eches.
+	- Pour le m\'ecanisme d'alignement vertical via le \vphantom, la
+	  commande \chemskipalign permet d'ignorer le groupe d'atomes
+	  dans lequel elle est \'ecrite.
+	- La commande \chemname permet d'afficher un nom sous une
+	  mol\'ecule. la commande \chemnameinit initialise la plus grande
+	  profondeur rencontr\'ee.
+	- La commande \lewis a \'et\'e modifi\'ee de telle sorte que les
+	  dessins des d\'ecorations soient proportionnels \`a la taille
+	  de la police.
+----------------------------------------------------------------------
+v0.3a       2011/01/08
+	- Correction d'un bug dans l'argument optionnel de \definesubmol
+	  lorsque celui-ci comporte des crochets.
+	- Mise \`a jour du manuel en anglais.
+	- Ajout de \vflipnext et \hflipnext pour retourner
+	  horizontalement ou verticalement la prochaine mol\'ecule.
+----------------------------------------------------------------------
+v0.4        2011/03/07
+	- chemfig est d\'esormais \'ecrit en plain-etex et donc
+	  utilisable par d'autres formats que LaTeX.
+	- Un peu plus de rigueur avec les catcodes des caract\`eres
+	  sp\'eciaux, notamment lorsque la commande \chemfig se trouve
+	  dans l'argument de \chemmove, \chemabove, \chembelow, \chemrel.
+	  TODO : faut-il \scantoker l'argument de \chemfig pour \^etre
+	  d\'efinitivement d\'ebarass\'e de ces histoires de catcode ???
+	- Correction d'un bug dans le calcul de l'angle des liaisons
\ No newline at end of file