mychemistry 1.2 (22mar11)

git-svn-id: svn://tug.org/texlive/trunk@21804 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 831 insertions, 0 deletions

diff --git a/Master/texmf-dist/tex/latex/mychemistry/mychemistry.sty b/Master/texmf-dist/tex/latex/mychemistry/mychemistry.sty
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+++ b/Master/texmf-dist/tex/latex/mychemistry/mychemistry.sty
@@ -0,0 +1,831 @@
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% ------------------------------------------------------------------------------------- %
+% - myChemistry - mychemistry.sty ----------------------------------------------------- %
+% - Creating reaction schemes with LaTeX and ChemFig ---------------------------------- %
+% ------------------------------------------------------------------------------------- %
+% - Clemens Niederberger -------------------------------------------------------------- %
+% - 2011/03/20 ------------------------------------------------------------------------ %
+% ------------------------------------------------------------------------------------- %
+% - http://www.niederberger-berlin.net/2011/02/latex-mychemistry/ --------------------- %
+% - kontakt@niederberger-berlin.net --------------------------------------------------- %
+% ------------------------------------------------------------------------------------- %
+% - If you have any ideas, questions, suggestions or bugs to report, please feel free - %
+% - to contact me. -------------------------------------------------------------------- %
+% ------------------------------------------------------------------------------------- %
+% - Copyright 2011 Clemens Niederberger                                               - %
+% -                                                                                   - %
+% - 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 Clemens Niederberger.                      - %
+% -                                                                                   - %
+% - This work consists of the files mychemistry.sty, mychemistry_de.tex and           - %
+% - mychemistry_en.tex                                                                - %
+% ------------------------------------------------------------------------------------- %
+% - 2011/02/24 version 1.0                                                            - %
+% ------------------------------------------------------------------------------------- %
+% - 2011/03/01 version 1.1                                                            - %
+% -   package option `english' added                                                  - %
+% -   package key `placement' added                                                   - %
+% -   rxnscheme key `placement' added                                                 - %
+% -   package key `shade=boolean' changed into package option `shade'                 - %
+% -   package option `nochemexec' added, will prevent mC from loading chemexec        - %
+% - 2011/03/20 version 1.2                                                            - %
+% -   license changed into LPPL 1.3 or later                                          - %
+% -   package option `nocompounds' added, will prevent mC from loading chemcompounds  - %
+% -   package option `chemstyle' added, will load chemstyle                           - %
+% -   package option `nomhchem' added, will prevent mC from loading mhchem            - %
+% -     if chemexec isn't loaded either                                               - %
+% -   package option `nopackages' added, will prevent mC from loading any             - %
+% -     chemistry package except chemfig                                              - %
+% -   some small issues resolved                                                      - %
+% -   bug in arrow type <=> resolved                                                  - %
+% -   arrow argument placement rewritten; two new keys for arrow: `aboveshift'        - %
+% -     and `belowshift' (causing new problems with alignment, though)                - %
+% -   wrong arrow alignment (due to last change) mainly resolved (NEEDS pgf v2.10!)   - %
+% -     => solved wrong branch alignment as well                                      - %
+% -   `inner sep' set to 0, arrow, transition & mesomeric adjusted                    - %
+% -   bug in arrow type -|> resolved                                                  - %
+% -   commands \makevisible / \makeinvisible added                                    - %
+% -   arrow key `both' added                                                          - %
+% -   rxn has now keys instead of an option                                           - %
+% -   commands \setrcndist, \setrxnalign, \setschemealign added                       - %
+% -   rxn-, rxnscheme-key align added                                                 - % 
+% ------------------------------------------------------------------------------------- %
+% - TODO                                                                              - %
+% -   make the arrow type {-|>} look nicer                                            - %
+% -   work on how chemistry-packages are automatically loaded;                        - %
+% -     add ui for easy handling this issue? (via \mCsetup ?)                         - %
+% -   add rotate=<winkel> for diagonal arrows?                                        - %
+% -   add \mCdefault or sim. to restore all default settings?                         - %
+% ------------------------------------------------------------------------------------- %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\def\@mc@version{v1.2}
+\def\@mc@date@de{20. M\"arz 2011}
+\def\@mc@date@en{March 20th 2011}
+\ProvidesPackage{mychemistry}[2011/03/20]
+\typeout{myChemistry \@mc@version}
+\typeout{2011/03/20 Clemens Niederberger}
+\typeout{}
+\RequirePackage{ifthen,calc,float}
+\RequirePackage{xkeyval}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Optionen, z.T. auch an chemexec weitergeben
+\newcommand{\@mc@exec@color}{black}
+\newcommand{\@mc@exec@shade}{false}
+\newif\if@usecolor\@usecolorfalse
+% wenn key color, dann Farbe und Option shade=true an chemexec weitergeben
+\define@key[MC]{mychemistry.sty}%
+  {color}{
+    \@usecolortrue
+    \renewcommand{\@mc@exec@color}{#1}
+    \renewcommand{\@mc@exec@shade}{true}
+  }
+% sonst nicht:
+\DeclareOptionX[MC]{nocolor}{
+  \@usecolortrue
+  \renewcommand{\@mc@exec@color}{black}
+  \renewcommand{\@mc@exec@shade}{false}
+}
+% shade separat (de-)aktivieren
+\DeclareOptionX[MC]{shade}{%
+  \renewcommand{\@mc@exec@shade}{true}
+}
+% chemexec abschalten
+\newcommand{\@mc@exec@true}{true}
+\DeclareOptionX[MC]{nochemexec}{%
+  \renewcommand{\@mc@exec@true}{false}
+}
+% mhchem abschalten
+\newcommand{\@mc@mhchem@true}{true}
+\DeclareOptionX[MC]{nomhchem}{%
+  \renewcommand{\@mc@mhchem@true}{false}
+}
+% chemcompounds abschalten
+\newcommand{\@mc@compound@true}{true}
+\DeclareOptionX[MC]{nocompounds}{%
+  \renewcommand{\@mc@compound@true}{false}
+}
+% chemstyle einschalten
+\newcommand{\@mc@chemstyle@true}{false}
+\DeclareOptionX[MC]{chemstyle}{%
+  \renewcommand{\@mc@chemstyle@true}{true}
+}
+% nur `chemfig' laden
+\DeclareOptionX[MC]{nopackages}{%
+  \renewcommand{\@mc@exec@true}{false}
+  \renewcommand{\@mc@mhchem@true}{false}
+  \renewcommand{\@mc@compound@true}{false}
+  \renewcommand{\@mc@chemstyle@true}{false}
+}
+% englische Version von chemexec, englische Variante von myChemistry
+\newcommand{\@mc@exec@english}{}
+\newcommand{\@mc@rs@name}{Reaktionsschema}
+\DeclareOptionX[MC]{english}{
+  \renewcommand{\@mc@exec@english}{,english}
+  \renewcommand{\@mc@rs@name}{Reaction scheme}
+}
+\newcommand{\@mc@rs@placement}{H}
+\newcommand{\@mc@rs@currentplacement}{\@mc@rs@placement}
+\define@key[MC]{mychemistry.sty}{placement}{
+  \renewcommand{\@mc@rs@placement}{#1}
+}
+\ProcessOptionsX[MC]
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% chemstyle laden, falls verfügbar und Option aktiv
+\IfFileExists{chemstyle.sty}{%
+  \ifthenelse{\equal{\@mc@chemstyle@true}{true}}{
+    \@ifpackageloaded{chemstyle}{}{
+      \RequirePackage[varioref=false,floats=float]{chemstyle}
+      \PackageInfo{mychemistry}{You loaded `chemstyle' with options `varioref=false' and `floats=float'. Please be aware, that you might need to restyle the float `table'. Take a look at the `chemstyle' documentation for further information.}
+    }
+  }{}
+}{}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% chemcompounds laden, falls verfügbar
+\IfFileExists{chemcompounds.sty}{%
+  \ifthenelse{\equal{\@mc@compound@true}{true}}{
+    \@ifpackageloaded{chemcompounds}{}{
+      \RequirePackage{chemcompounds}
+    }
+  }{}
+}{
+  \typeout{`chemcompounds' is not installed.}
+}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% chemfig laden, falls verfügbar
+\IfFileExists{chemfig.sty}{%
+  \@ifpackageloaded{chemfig}{}{
+    \RequirePackage{chemfig}
+  }
+  \usetikzlibrary{arrows,positioning,decorations.pathmorphing,shapes,calc,matrix,chains,scopes}
+}{% sonst Fehlermeldung
+  \PackageError{mychemistry}{`ChemFig' is not installed! `mychemistry' can't work without it!}
+}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% chemexec laden, falls verfügbar, falls nicht, dann wenigstens mhchem laden
+\IfFileExists{chemexec.sty}{% mit den Default-Optionen color=black, shade=false,exercise,exersize=large
+  \ifthenelse{\equal{\@mc@exec@true}{true}}{
+    \ifthenelse{\equal{\@mc@mhchem@true}{true}}{}{
+      \PackageWarning{mychemistry}{You used the option `nomhchem' but not `nochemexec'. Please be aware that `mhchem' is loaded by `chemexec' anyway.}
+    }
+    \@ifpackageloaded{chemexec}{}{
+      \RequirePackage[color=\@mc@exec@color,shade=\@mc@exec@shade,exercise,exersize=large\@mc@exec@english]{chemexec}
+    }
+  }{}
+}{
+  \typeout{`chemexec' ist not installed.}
+  \IfFileExists{mhchem.sty}{
+    \ifthenelse{\equal{\@mc@mhchem@true}{true}}{
+      \@ifpackageloaded{mhchem}{}{
+        \RequirePackage[version=3]{mhchem}
+      }
+    }{}
+  }{
+    \typeout{`mhchem' ist not installed.}
+  }
+}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% NEUE BEFEHLE:                                                                         %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\providecommand{\mCversion}{\@mc@version}
+\providecommand{\mCdate}[1]{
+  \ifthenelse{\equal{#1}{de}}{\@mc@date@de}{}
+  \ifthenelse{\equal{#1}{en}}{\@mc@date@en}{}
+}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% PFEILE ------------------------------------------------------------------------------ %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% interne Befehle, Voreinstellungen --------------------------------------------------- %
+\newcommand{\@arrow@above}{above}                % oben
+\newcommand{\@arrow@currentabove}{\@arrow@above} %
+\newcommand{\@arrow@below}{below}                % unten
+\newcommand{\@arrow@currentbelow}{\@arrow@below} %
+\newcommand{\@arrow@direction}{right}            % Richtung
+\newcommand{\@arrow@currentdirection}{\@arrow@direction}
+\newcommand{\@arrow@currentlength}{\@arrow@length}
+\newlength{\@arrow@length@actual}
+\newcommand{\@arrow@rotate}{}
+\newcommand{\@arrow@argument@angle}{}
+\newcommand{\@arrow@argument@shift}{2pt}
+\newcommand{\@arrow@argument@anchor}{}
+\newcommand{\@arrow@argument@both}{}
+%\newcommand{\@arrow@argument@size}{}
+\newcommand{\@arrow@above@anchor}{}
+\newcommand{\@arrow@below@anchor}{}
+\newcommand{\@arrow@type}{->}                    % Pfeiltyp
+\newcommand{\@arrow@currenttype}{\@arrow@type}   %
+\newcommand{\@arrow@start@up}{0,0.05}            % Verschiebung für Glgw-Pfeil
+\newcommand{\@arrow@start@down}{0,-0.05}         %
+\newcommand{\@arrow@placement}{on chain=going \@arrow@currentdirection} % wohin?
+\newcommand{\@arrow@currentplacement}{\@arrow@placement}
+\newcommand{\@arrow@cross@base@x}{}              % Befehle für durchgestrichenen Pfeil
+\newcommand{\@arrow@cross@base@y}{}              %
+\newcommand{\@arrow@cross@angle}{}               %
+\newcommand{\@arrow@cross@length}{}              %
+\newcommand{\@arrow@cross@draw}{}                %
+
+% Laengenfaktor ----------------------------------------------------------------------- %
+\newcommand{\@arrow@length}{1.0}                 % Längenfaktor
+\newcommand{\@arrow@length@factor}{1.0}          % Default-Faktor
+\newcommand{\@arrow@end}{\@arrow@length@actual,0} % Pfeilende
+\define@key{arrow}{length}[\@arrow@length]{%     %
+    \renewcommand{\@arrow@currentlength}{#1}}%   %
+\newlength{\@arrow@length@default}               %
+\setlength{\@arrow@length@default}{5em}          % Default-Laenge
+\newcommand{\arrowlength}[1]{\setlength{\@arrow@length@default}{#1}}
+
+% Beschriftungen ---------------------------------------------------------------------- %
+\newlength{\@arrow@argument@aboveshift}           % Verschieben der Beschriftung
+\newlength{\@arrow@argument@belowshift}           % Verschieben der Beschriftung
+\define@key{arrow}{aboveshift}[2pt]{%
+  \setlength{\@arrow@argument@aboveshift}{#1}}
+\define@key{arrow}{belowshift}[2pt]{%
+  \setlength{\@arrow@argument@belowshift}{#1}}
+\define@key{arrow}{both}[]{
+  \renewcommand{\@arrow@argument@both}{true}
+}
+
+% Anker ------------------------------------------------------------------------------- %
+\newcommand{\@arrow@name}{}                      % Anker
+\newcommand{\@arrow@currentname}{\@arrow@name}   %
+\define@key{arrow}{name}[\@arrow@name]{%         %
+    \renewcommand{\@arrow@currentname}{#1}}%     %
+
+% Richtung ---------------------------------------------------------------------------- %
+\define@key{arrow}{direction}[\@arrow@direction]{%
+    \renewcommand{\@arrow@currentdirection}{#1}  %
+    \ifthenelse{\equal{#1}{right}}{% nach rechts, Einstellungen:
+     \renewcommand{\@arrow@end}{\@arrow@length@actual,0}
+     \renewcommand{\@arrow@currentabove}{above}
+     \renewcommand{\@arrow@currentbelow}{below}
+     \renewcommand{\@arrow@above@anchor}{south}
+     \renewcommand{\@arrow@below@anchor}{north}
+     \renewcommand{\@arrow@argument@anchor}{
+       \node(@arrow@center) at ($(\tikzchainprevious.east)+(.5\@arrow@length@actual+\@rxn@node@distance,0)$) {};
+     }
+     \renewcommand{\@arrow@argument@angle}{0}
+     \renewcommand{\@arrow@rotate}{0}
+     \renewcommand{\@arrow@start@up}{0,0.03}
+     \renewcommand{\@arrow@start@down}{0,-0.03}
+     \renewcommand{\@arrow@cross@base@x}{.15em}
+     \renewcommand{\@arrow@cross@base@y}{0}
+     \renewcommand{\@arrow@cross@angle}{60}
+     \renewcommand{\@arrow@cross@length}{.5em}
+    }{
+     \ifthenelse{\equal{#1}{above right}}{% nach oben rechts, Einstellungen:
+      \renewcommand{\@arrow@end}{\@arrow@length@actual,\@arrow@length@actual}
+      \renewcommand{\@arrow@currentabove}{above left}
+      \renewcommand{\@arrow@currentbelow}{below right}
+      \renewcommand{\@arrow@above@anchor}{south}
+      \renewcommand{\@arrow@below@anchor}{north}
+      \renewcommand{\@arrow@argument@anchor}{
+        \node(@arrow@center) at ($(\tikzchainprevious.north east)+(.5\@arrow@length@actual+.707\@rxn@node@distance,.5\@arrow@length@actual+.707\@rxn@node@distance)$) {};
+      }
+      \renewcommand{\@arrow@argument@angle}{45}
+      \renewcommand{\@arrow@rotate}{45}
+      \renewcommand{\@arrow@start@up}{-0.02,0.02}
+      \renewcommand{\@arrow@start@down}{0.02,-0.02}
+      \renewcommand{\@arrow@cross@base@x}{.1em}
+      \renewcommand{\@arrow@cross@base@y}{.1em}
+      \renewcommand{\@arrow@cross@angle}{-15}
+      \renewcommand{\@arrow@cross@length}{.7em}
+     }{
+     \ifthenelse{\equal{#1}{above}}{% nach oben, Einstellungen:
+      \renewcommand{\@arrow@end}{0,\@arrow@length@actual}
+      \renewcommand{\@arrow@currentabove}{left}
+      \renewcommand{\@arrow@currentbelow}{right}
+      \renewcommand{\@arrow@above@anchor}{east}
+      \renewcommand{\@arrow@below@anchor}{west}
+      \renewcommand{\@arrow@argument@anchor}{
+       \node(@arrow@center) at ($(\tikzchainprevious.north)+(0,.5\@arrow@length@actual+\@rxn@node@distance)$) {};
+      }
+      \renewcommand{\@arrow@argument@angle}{90}
+      \renewcommand{\@arrow@rotate}{0}
+      \renewcommand{\@arrow@start@up}{-0.03,0}
+      \renewcommand{\@arrow@start@down}{0.03,0}
+      \renewcommand{\@arrow@cross@base@x}{0}
+      \renewcommand{\@arrow@cross@base@y}{.15em}
+      \renewcommand{\@arrow@cross@angle}{30}
+      \renewcommand{\@arrow@cross@length}{.5em}
+      }{
+       \ifthenelse{\equal{#1}{above left}}{% nach oben links, Einstellungen:
+        \renewcommand{\@arrow@end}{-\@arrow@length@actual,\@arrow@length@actual}
+        \renewcommand{\@arrow@currentabove}{above right}
+        \renewcommand{\@arrow@currentbelow}{below left}
+        \renewcommand{\@arrow@above@anchor}{south}
+        \renewcommand{\@arrow@below@anchor}{north}
+        \renewcommand{\@arrow@argument@anchor}{
+          \node(@arrow@center) at ($(\tikzchainprevious.north west)+(-.5\@arrow@length@actual-.707\@rxn@node@distance,.5\@arrow@length@actual+.707\@rxn@node@distance)$) {};
+        }
+        \renewcommand{\@arrow@argument@angle}{-45}
+        \renewcommand{\@arrow@rotate}{-45}
+        \renewcommand{\@arrow@start@up}{-0.02,-0.02}
+        \renewcommand{\@arrow@start@down}{0.02,0.02}
+        \renewcommand{\@arrow@cross@base@x}{-.1em}
+        \renewcommand{\@arrow@cross@base@y}{.1em}
+        \renewcommand{\@arrow@cross@angle}{15}
+        \renewcommand{\@arrow@cross@length}{.7em}
+       }{
+       \ifthenelse{\equal{#1}{left}}{% nach links, Einstellungen:
+        \renewcommand{\@arrow@end}{-\@arrow@length@actual,0}
+        \renewcommand{\@arrow@currentabove}{above}
+        \renewcommand{\@arrow@currentbelow}{below}
+        \renewcommand{\@arrow@above@anchor}{south}
+        \renewcommand{\@arrow@below@anchor}{north}
+        \renewcommand{\@arrow@argument@anchor}{
+          \node(@arrow@center) at ($(\tikzchainprevious.west)+(-.5\@arrow@length@actual-\@rxn@node@distance,0)$) {};
+        }
+        \renewcommand{\@arrow@argument@angle}{0}
+        \renewcommand{\@arrow@rotate}{0}
+        \renewcommand{\@arrow@start@up}{0,-0.03}
+        \renewcommand{\@arrow@start@down}{0,0.03}
+        \renewcommand{\@arrow@cross@base@x}{.15em}
+        \renewcommand{\@arrow@cross@base@y}{0}
+        \renewcommand{\@arrow@cross@angle}{60}
+        \renewcommand{\@arrow@cross@length}{.5em}
+       }{
+        \ifthenelse{\equal{#1}{below left}}{% nach unten links, Einstellungen:
+         \renewcommand{\@arrow@end}{-\@arrow@length@actual,-\@arrow@length@actual}
+         \renewcommand{\@arrow@currentabove}{above left}
+         \renewcommand{\@arrow@currentbelow}{below right}
+         \renewcommand{\@arrow@above@anchor}{south}
+         \renewcommand{\@arrow@below@anchor}{north}
+         \renewcommand{\@arrow@argument@anchor}{
+           \node(@arrow@center) at ($(\tikzchainprevious.south west)+(-.5\@arrow@length@actual-.707\@rxn@node@distance,-.5\@arrow@length@actual-.707\@rxn@node@distance)$) {};
+         }
+         \renewcommand{\@arrow@argument@angle}{45}
+         \renewcommand{\@arrow@rotate}{45}
+         \renewcommand{\@arrow@start@up}{0.02,-0.02}
+         \renewcommand{\@arrow@start@down}{-0.02,0.02}
+         \renewcommand{\@arrow@cross@base@x}{.1em}
+         \renewcommand{\@arrow@cross@base@y}{.1em}
+         \renewcommand{\@arrow@cross@angle}{-15}
+         \renewcommand{\@arrow@cross@length}{.7em}
+        }{
+         \ifthenelse{\equal{#1}{below}}{% nach unten, Einstellungen:
+          \renewcommand{\@arrow@end}{0,-\@arrow@length@actual}
+          \renewcommand{\@arrow@currentabove}{left}
+          \renewcommand{\@arrow@currentbelow}{right}
+          \renewcommand{\@arrow@above@anchor}{east}
+          \renewcommand{\@arrow@below@anchor}{west}
+          \renewcommand{\@arrow@argument@anchor}{
+            \node(@arrow@center) at ($(\tikzchainprevious.south)+(0,-.5\@arrow@length@actual-\@rxn@node@distance)$) {};
+          }
+          \renewcommand{\@arrow@argument@angle}{90}
+          \renewcommand{\@arrow@rotate}{0}
+          \renewcommand{\@arrow@start@up}{0.03,0}
+          \renewcommand{\@arrow@start@down}{-0.03,0}
+          \renewcommand{\@arrow@cross@base@x}{0}
+          \renewcommand{\@arrow@cross@base@y}{.15em}
+          \renewcommand{\@arrow@cross@angle}{30}
+          \renewcommand{\@arrow@cross@length}{.5em}
+         }{
+          \ifthenelse{\equal{#1}{below right}}{% nach unten rechts, Einstellungen:
+           \renewcommand{\@arrow@end}{\@arrow@length@actual,-\@arrow@length@actual}
+           \renewcommand{\@arrow@currentabove}{above right}
+           \renewcommand{\@arrow@currentbelow}{below left}
+           \renewcommand{\@arrow@above@anchor}{south}
+           \renewcommand{\@arrow@below@anchor}{north}
+           \renewcommand{\@arrow@argument@anchor}{
+             \node(@arrow@center) at ($(\tikzchainprevious.south east)+(.5\@arrow@length@actual+.707\@rxn@node@distance,-.5\@arrow@length@actual-.707\@rxn@node@distance)$) {};
+           }
+           \renewcommand{\@arrow@argument@angle}{-45}
+           \renewcommand{\@arrow@rotate}{-45}
+           \renewcommand{\@arrow@start@up}{0.02,0.02}
+           \renewcommand{\@arrow@start@down}{-0.02,-0.02}
+           \renewcommand{\@arrow@cross@base@x}{-.1em}
+           \renewcommand{\@arrow@cross@base@y}{.1em}
+           \renewcommand{\@arrow@cross@angle}{15}
+           \renewcommand{\@arrow@cross@length}{.7em}
+          }{
+           \PackageError{mychemistry}{Unknown arrow direction}% oder Fehler
+          }
+         }
+        }
+       }
+      }
+     }
+    }
+   }
+}
+
+% Pfeiltyp ---------------------------------------------------------------------------- %
+\newcommand{\@arrow@drawing}{}
+\define@key{arrow}{type}[\@arrow@type]{%
+  \renewcommand{\@arrow@currenttype}{#1}
+  \ifthenelse{\equal{#1}{->}}{
+  \renewcommand{\@arrow@drawing}{\draw[->,thick,text height=0] (0,0) -- node[pos=.5](@arrow@center){} ++(\@arrow@end);}
+  }{
+    \ifthenelse{\equal{#1}{<->}}{
+    \renewcommand{\@arrow@drawing}{\draw[<->,thick,text height=0] (0,0) -- node[pos=.5](@arrow@center){} ++(\@arrow@end);}
+    }{
+      \ifthenelse{\equal{#1}{<-}}{
+      \renewcommand{\@arrow@drawing}{\draw[<-,thick,text height=0] (0,0) -- node[pos=.5](@arrow@center){} ++(\@arrow@end);}
+      }{
+        \ifthenelse{\equal{#1}{<=>}}{
+        \renewcommand{\@arrow@drawing}{\draw[-left to,thick,text height=0] (\@arrow@start@up) -- ++(\@arrow@end);\draw[left to-,thick,text height=0] (\@arrow@start@down) -- ++(\@arrow@end);\draw[draw=none] (0,0) -- node[pos=.5](@arrow@center){} ++(\@arrow@end);}
+        }{
+          \ifthenelse{\equal{#1}{-|>}}{
+           \setlength{\@arrow@argument@aboveshift}{.75em}
+           \setlength{\@arrow@argument@belowshift}{.75em}
+           \renewcommand{\@arrow@cross@draw}{\draw[thick] ($(@arrow@center.base) + (\@arrow@cross@base@x,\@arrow@cross@base@y) + (\@arrow@cross@angle:\@arrow@cross@length)$) -- ($(@arrow@center.base) + (\@arrow@cross@base@x,\@arrow@cross@base@y) + (\@arrow@cross@angle-180:\@arrow@cross@length)$);\draw[thick] ($(@arrow@center.base) + (-\@arrow@cross@base@x,-\@arrow@cross@base@y) + (\@arrow@cross@angle:\@arrow@cross@length)$) -- ($(@arrow@center.base) + (-\@arrow@cross@base@x,-\@arrow@cross@base@y) + (\@arrow@cross@angle-180:\@arrow@cross@length)$);}
+           \renewcommand{\@arrow@drawing}{\draw[->,thick,text height=0] (0,0) -- node[pos=.5](@arrow@center){} ++(\@arrow@end);\@arrow@cross@draw}
+          }{
+           \PackageError{mychemistry}{Unknown arrow type}% oder Fehler
+          }
+        }
+      }
+    }
+  }
+}%
+% ------------------------------------------------------------------------------------- %
+% Maße der Nodes der Pfeilargumente bestimmen, größere später an Pfeil weitergeben
+\newlength{\@mc@height@A}
+\newlength{\@mc@height@B}
+\newlength{\@arrow@argument@height}
+\newlength{\@mc@width@A}
+\newlength{\@mc@width@B}
+\newlength{\@arrow@argument@width}
+\newcommand{\@mc@savenode}{%
+    \global\let\@mc@minx=\pgfpositionnodelaterminx%
+    \global\let\@mc@maxx=\pgfpositionnodelatermaxx%
+    \global\let\@mc@miny=\pgfpositionnodelaterminy%
+    \global\let\@mc@maxy=\pgfpositionnodelatermaxy%
+}%
+% der nächste Befehl benötigt pgf v2.10!
+\newcommand{\@mc@largernode}[2]{
+  \@ifundefined{pgfpositionnodelater}{
+    \PackageError{mychemistry}{The command \string\pgfpositionnodelater is undefined. Make sure, you have installed the latest version of pgf.}
+  }{}
+  {\pgfpositionnodelater{\@mc@savenode}
+  \node{#1};
+  \setlength{\@mc@width@A}{\@mc@maxx}%
+  \addtolength{\@mc@width@A}{-\@mc@minx}
+  \setlength{\@mc@height@A}{\@mc@maxy}%
+  \addtolength{\@mc@height@A}{-\@mc@miny}
+  \node{#2};
+  \setlength{\@mc@width@B}{\@mc@maxx}%
+  \addtolength{\@mc@width@B}{-\@mc@minx}
+  \setlength{\@mc@height@B}{\@mc@maxy}%
+  \addtolength{\@mc@height@B}{-\@mc@miny}
+  \pgfmathsetlength{\@arrow@argument@width}{max(\@mc@width@A,\@mc@width@B)}
+  \pgfmathsetlength{\@arrow@argument@height}{max(\@mc@height@A,\@mc@height@B)}
+  \global\@arrow@argument@width=\@arrow@argument@width
+  \global\@arrow@argument@height=\@arrow@argument@height
+  }
+}
+
+% Pfeil zeichnen ---------------------------------------------------------------------- %
+\newcommand{\@arrow}[3][]{
+ \renewcommand{\@arrow@length@factor}{\@arrow@currentlength}
+ \setlength{\@arrow@length@actual}{\@arrow@currentlength\@arrow@length@default}
+ \ifthenelse{\equal{\@arrow@argument@both}{true}}{
+   \@mc@largernode{#2}{#3}
+ }{
+   \setlength{\@arrow@argument@width}{0pt}
+   \setlength{\@arrow@argument@height}{0pt}
+ }
+ \draw node[on chain=going \@arrow@currentdirection](\@arrow@currentname) {\tikz{
+   \@arrow@drawing
+   }
+ };
+ \@arrow@argument@anchor
+ \draw node[anchor=\@arrow@above@anchor,rotate=\@arrow@rotate,minimum width=\@arrow@argument@width, minimum height=\@arrow@argument@height]
+  at ($(@arrow@center.base)+(90+\@arrow@argument@angle:\@arrow@argument@aboveshift)$) {#2};
+ \draw node[anchor=\@arrow@below@anchor,rotate=\@arrow@rotate,minimum width=\@arrow@argument@width, minimum height=\@arrow@argument@height]
+  at ($(@arrow@center.base)+(-90+\@arrow@argument@angle:\@arrow@argument@belowshift)$) {#3};
+ \setlength{\@arrow@argument@aboveshift}{2pt}
+ \setlength{\@arrow@argument@belowshift}{2pt}
+}
+
+% Voreinstellungen:
+\presetkeys%
+  {arrow}
+  {direction=\@arrow@direction,length=\@arrow@length,type=\@arrow@type,aboveshift=\@arrow@argument@shift,belowshift=\@arrow@argument@shift}
+  {}
+
+% Eigentlicher Befehl:
+\providecommand{\arrow}[3][]{
+ \setkeys{arrow}{#1}
+ \@arrow{#2}{#3}
+}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% MERGE ------------------------------------------------------------------------------- %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\newcommand{\@merge@direction}{below}
+\newcommand{\@merge@to}{}
+\newcommand{\@merge@from@one}{}
+\newcommand{\@merge@from@two}{}
+\newcommand{\@merge}[3]{
+  \renewcommand{\@merge@to}{#1}
+  \renewcommand{\@merge@from@one}{#2}
+  \renewcommand{\@merge@from@two}{#3}
+}
+% Basisbefehle ------------------------------------------------------------------------ %
+\newcommand{\@merge@right}{
+ \draw[stealth-,thick] ($(\@merge@to.west)+(-1em,0)$) -- ($(\@merge@to.west)+(-4em,0)$) node(crossing) {};
+ \draw[thick] ($(\@merge@from@one.east)+(1em,0)$) -| (crossing.base);
+ \draw[thick] ($(\@merge@from@two.east)+(1em,0)$) -| (crossing.base);
+}
+\newcommand{\@merge@above}{
+ \draw[stealth-,thick] ($(\@merge@to.south)+(0,-1em)$) -- ($(\@merge@to.south)+(0,-4em)$) node(crossing) {};
+ \draw[thick] (crossing.base) -| ($(\@merge@from@one.north)+(0,1em)$);
+ \draw[thick] (crossing.base) -| ($(\@merge@from@two.north)+(0,1em)$);
+}
+\newcommand{\@merge@left}{
+ \draw[stealth-,thick] ($(\@merge@to.east)+(1em,0)$) -- ($(\@merge@to.east)+(4em,0)$) node(crossing) {};
+ \draw[thick] ($(\@merge@from@one.west)+(-1em,0)$) -| (crossing.base);
+ \draw[thick] ($(\@merge@from@two.west)+(-1em,0)$) -| (crossing.base);;
+}
+\newcommand{\@merge@below}[3]{
+ \draw[stealth-,thick] ($(\@merge@to.north)+(0,1em)$) -- ($(\@merge@to.north)+(0,4em)$) node(crossing) {};
+ \draw[thick] (crossing.base) -| ($(\@merge@from@one.south)+(0,-1em)$);
+ \draw[thick] (crossing.base) -| ($(\@merge@from@two.south)+(0,-1em)$);
+}
+% key zur Auswahl --------------------------------------------------------------------- %
+\define@choicekey{merge}{direction}[\val\nr]{right,above,left,below}[below]{
+  \ifcase\nr\relax
+    \@merge@right
+  \or
+    \@merge@above
+  \or
+    \@merge@left
+  \or
+    \@merge@below
+  \fi
+}
+% Voreinstellung ---------------------------------------------------------------------- %
+\presetkeys%
+  {merge}
+  {direction=below}
+  {}
+% eigentlicher Befehl ----------------------------------------------------------------- %
+\newcommand{\merge}[4][]{
+  \@merge{#2}{#3}{#4}
+  \setkeys{merge}{#1}
+}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% REAKTIONSSCHEMA --------------------------------------------------------------------- %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\newlength{\@rxn@node@distance}
+\setlength{\@rxn@node@distance}{1em}
+\providecommand{\setrcndist}[1]{
+  \ifthenelse{\equal{#1}{}}{
+    \setlength{\@rxn@node@distance}{1em}
+  }{
+    \setlength{\@rxn@node@distance}{#1}
+  }
+}
+% ------------------------------------------------------------------------------------- %
+% Schema ------------------------------------------------------------------------------ %
+% ------------------------------------------------------------------------------------- %
+\newcommand{\@mc@rs@scale}{1.0}                  % Default-Skalierung
+\newcommand{\@mc@rs@currentscale}{\@mc@rs@scale} %
+\providecommand{\setschemename}[1]{\renewcommand{\@mc@rs@name}{#1}}
+\newcommand{\@mc@rs@caption}{}                   % Beschriftung
+\newcommand{\@mc@rs@label}{}                     % Label
+\newcommand{\@mc@rs@currentlabel}{\@mc@rs@label} %
+\define@key{rxnscheme}{label}{%                  %
+  \ifthenelse{\equal{#1}{}}{}{                   %
+    \renewcommand{\@mc@rs@currentlabel}{#1}      %
+  }                                              %
+}                                                %
+\define@key{rxnscheme}{scale}[1.0]{              % Skalierung
+  \renewcommand{\@mc@rs@currentscale}{#1}        %
+}                                                %
+\define@key{rxnscheme}{name}{                    % Name
+  \renewcommand{\@mc@rs@name}{#1}                %
+}                                                %
+\define@key{rxnscheme}{placement}{               % Float-Platzierung
+  \renewcommand{\@mc@rs@currentplacement}{#1}    %
+}                                                %
+\newcommand{\@mc@rs@align}{center}               %
+\newcommand{\@mc@rs@right}{right}                %
+\newcommand{\@mc@rs@center}{center}              %
+\newcommand{\@mc@rs@left}{left}                  %
+\providecommand{\setschemealign}[1]{             %
+  \ifthenelse{\equal{#1}{}}{                     %
+    \renewcommand{\@mc@rs@align}{center}         %
+  }{                                             %
+    \renewcommand{\@mc@rs@align}{#1}             %
+  }                                              %
+}                                                %
+\define@key{rxnscheme}{align}{                   % Alignment
+  \renewcommand{\@mc@rs@align}{#1}
+}
+% Voreinstellungen:
+%\presetkeys%
+%  {rxnscheme}
+%  {scale=\@mc@rs@scale,align=\@mc@rs@align,label=\@mc@rs@label}
+%  {}
+% Gleitumgebung
+\floatstyle{ruled}
+\newfloat{rxnfloat}{\@mc@rs@currentplacement}{rxnscheme}
+\floatname{rxnfloat}{\@mc@rs@name}               % Name ändern
+% eigentliche Umgebung:
+\newenvironment{rxnscheme}[2][]{%
+  \setkeys{rxnscheme}{#1}
+  \renewcommand\@mc@rs@caption{#2}
+  \begin{rxnfloat}
+  %\centering
+  \ifx\@mc@rs@align\@mc@rs@center \centering \fi
+  \ifx\@mc@rs@align\@mc@rs@left \raggedright \fi
+  \ifx\@mc@rs@align\@mc@rs@right \raggedleft \fi
+  \@mc@atomsize\@mc@bondlength\@mc@bondshape
+  \begin{tikzpicture}[every picture/.style={scale=\@mc@rs@currentscale},start chain,node distance=\@rxn@node@distance,inner sep=0pt]
+}{%
+  \end{tikzpicture}%
+  \caption{\@mc@rs@caption}
+  \ifthenelse{\equal{\@mc@rs@currentlabel}{}}{}{\label{\@mc@rs@currentlabel}}
+  \end{rxnfloat}
+}
+
+% ------------------------------------------------------------------------------------- %
+% einfache Reaktion ------------------------------------------------------------------- %
+% ------------------------------------------------------------------------------------- %
+\newcommand{\@mc@reaction@scale}{1.0}
+\newcommand{\@mc@reaction@align}{center}
+\providecommand{\setrxnalign}[1]{
+  \ifthenelse{\equal{#1}{}}{
+    \renewcommand{\@mc@reaction@align}{center}
+  }{
+    \renewcommand{\@mc@reaction@align}{#1}
+  }
+}
+\newcommand{\@mc@reaction@right}{right}
+\newcommand{\@mc@reaction@center}{center}
+\newcommand{\@mc@reaction@left}{left}
+\define@key{rxn}{scale}{
+  \renewcommand{\@mc@reaction@scale}{#1}}
+\define@key{rxn}{align}{
+  \renewcommand{\@mc@reaction@align}{#1}}
+% Voreinstellungen:
+%\presetkeys%
+%  {rxn}
+%  {scale=\@mc@reaction@scale,align=\@mc@reaction@align}
+%  {}
+\newenvironment{rxn}[1][]{%
+  \setkeys{rxn}{#1}
+  \ifx\@mc@reaction@align\@mc@reaction@center
+  \begin{center}
+  \fi
+  \ifx\@mc@reaction@align\@mc@reaction@left
+  \begin{flushleft}
+  \fi
+  \ifx\@mc@reaction@align\@mc@reaction@right
+  \begin{flushright}
+  \fi
+  \@mc@bondlength\@mc@bondshape\@mc@atomsize
+  \begin{tikzpicture}[every picture/.style={scale=\@mc@reaction@scale},start chain,node distance=\@rxn@node@distance,inner sep=0pt]
+}{%
+  \end{tikzpicture}%
+  \ifx\@mc@reaction@align\@mc@reaction@center
+  \end{center}
+  \fi
+  \ifx\@mc@reaction@align\@mc@reaction@left
+  \end{flushleft}
+  \fi
+  \ifx\@mc@reaction@align\@mc@reaction@right
+  \end{flushright}
+  \fi
+}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% REAKTANDEN -------------------------------------------------------------------------- %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Standardreaktand -------------------------------------------------------------------- %
+\newcommand{\@mc@reactand}[3][]{\draw node[on chain=going #1](#3) {#2};}
+\providecommand{\reactand}[3][right]{\@mc@reactand[#1]{#2}{#3}}
+
+% Mesomerie --------------------------------------------------------------------------- %
+\newcommand{\@mc@mesomeric}[3][]{\draw node[inner sep=1pt,on chain=going #1,left delimiter={[},right delimiter={]}](#3) {#2};}
+\providecommand{\mesomeric}[3][right]{\@mc@mesomeric[#1]{\begin{tikzpicture}[start branch]#2\end{tikzpicture}}{#3}}
+\providecommand{\marrow}[1][right]{\arrow[type=<->,length=.5,direction=#1]{}{}}
+\providecommand{\dummy}[1][]{\draw node[on chain,xshift=-\@rxn@node@distance](#1) {};}
+
+% Uebergangszustand ------------------------------------------------------------------- %
+\newcommand\@mc@transition@name{}
+\newcommand{\@mc@transition}[3][]{
+  \ifthenelse{\equal{#3}{}}{\renewcommand\@mc@transition@name{a}}{\renewcommand\@mc@transition@name{#3}}
+  \draw node[inner sep=1pt,on chain=going #1,left delimiter={[},right delimiter={]}](\@mc@transition@name) {#2} node at ($(\@mc@transition@name.north east)+(.25,0)$) {$\ddagger$};
+}
+\providecommand{\transition}[3][right]{\@mc@transition[#1]{\begin{tikzpicture}[start branch]#2\end{tikzpicture}}{#3}}
+
+% Abzweigung -------------------------------------------------------------------------- %
+\newcommand{\@mc@branch}[3][]{\node[#1] (#3) {#2};}
+\providecommand{\branch}[3][on chain=going right]{\@mc@branch[#1]{\begin{tikzpicture}[start branch]#2\end{tikzpicture}}{#3}}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Sonstiges --------------------------------------------------------------------------- %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Elektronenverschiebungspfeile ------------------------------------------------------- %
+\providecommand{\elmove}[5][->,red,shorten <=3pt,shorten >=1pt]{\chemmove{\draw[#1](#2).. controls +(#3) and +(#5)..(#4);}}
+% Bindungslänge ----------------------------------------------------------------------- %
+\newcommand{\@mc@bondlength}{\setatomsep{1.8em}}
+\providecommand{\bondlength}[1]{
+  \ifthenelse{\equal{#1}{}}{
+    \renewcommand{\@mc@bondlength}{\setatomsep{1.8em}}
+  }{
+    \renewcommand{\@mc@bondlength}{\setatomsep{#1}}
+  }
+}
+% Keilbindungen ----------------------------------------------------------------------- %
+\newcommand{\@mc@bondshape@one}{3pt}
+\newcommand{\@mc@bondshape@two}{.5pt}
+\newcommand{\@mc@bondshape@three}{1pt}
+\providecommand{\bondshape}[3]{
+  \ifthenelse{\equal{#1}{}}{
+    \renewcommand{\@mc@bondshape@one}{3pt}
+  }{
+    \renewcommand{\@mc@bondshape@one}{#1}
+  }
+  \ifthenelse{\equal{#2}{}}{
+    \renewcommand{\@mc@bondshape@two}{.5pt}
+  }{
+    \renewcommand{\@mc@bondshape@two}{#2}
+  }
+  \ifthenelse{\equal{#3}{}}{
+    \renewcommand{\@mc@bondshape@three}{1pt}
+  }{
+    \renewcommand{\@mc@bondshape@three}{#3}
+  }
+}
+\newcommand{\@mc@bondshape}{\setcrambond{\@mc@bondshape@one}{\@mc@bondshape@two}{\@mc@bondshape@three}}
+% Atomgröße --------------------------------------------------------------------------- %
+\newcommand{\@mc@atomsize}{\small}
+\providecommand{\atomsize}[1]{
+  \ifthenelse{\equal{#1}{}}{
+    \renewcommand{\@mc@atomsize}{\small}
+  }{
+    \renewcommand{\@mc@atomsize}{#1}
+  }
+}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% NODES SICHTBAR/UNSICHTBAR MACHEN ---------------------------------------------------- %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\newcommand\makevisible{
+  \renewcommand{\@mc@branch}[3][]{\node[draw=purple,dotted,##1] (##3) {##2};}
+  \renewcommand{\@mc@reactand}[3][]{\draw node[draw=red!60,solid,on chain=going ##1](##3) {##2};}
+  \renewcommand{\@mc@mesomeric}[3][]{\draw node[draw=red!60,solid,on chain=going ##1,left delimiter={[},right delimiter={]}](##3) {##2};}
+  \renewcommand{\@arrow}[3][]{
+   \renewcommand{\@arrow@length@factor}{\@arrow@currentlength}
+   \setlength{\@arrow@length@actual}{\@arrow@currentlength\@arrow@length@default}
+   \ifthenelse{\equal{\@arrow@argument@both}{true}}{
+     \@mc@largernode{##2}{##3}
+   }{
+     \setlength{\@arrow@argument@width}{0pt}
+     \setlength{\@arrow@argument@height}{0pt}
+   }
+   \draw node[solid,on chain=going \@arrow@currentdirection](\@arrow@currentname) {\tikz{
+     \@arrow@drawing
+     }
+   };
+   \@arrow@argument@anchor
+   \draw node[draw=green!60,solid,anchor=\@arrow@above@anchor,rotate=\@arrow@rotate,minimum width=\@arrow@argument@width, minimum height=\@arrow@argument@height]
+    at ($(@arrow@center.base)+(90+\@arrow@argument@angle:\@arrow@argument@aboveshift)$) {##2};
+   \draw node[draw=blue!60,solid,anchor=\@arrow@below@anchor,rotate=\@arrow@rotate,minimum width=\@arrow@argument@width, minimum height=\@arrow@argument@height]
+    at ($(@arrow@center.base)+(-90+\@arrow@argument@angle:\@arrow@argument@belowshift)$) {##3};
+   \setlength{\@arrow@argument@aboveshift}{2pt}
+   \setlength{\@arrow@argument@belowshift}{2pt}
+  }
+}
+
+\newcommand\makeinvisible{
+  \renewcommand{\@mc@reactand}[3][]{\draw node[on chain=going ##1](##3) {##2};}
+  \renewcommand{\@mc@mesomeric}[3][]{\draw node[on chain=going ##1,left delimiter={[},right delimiter={]}](##3) {##2};}
+  \renewcommand{\@mc@branch}[3][]{\node[##1] (##3) {##2};}
+  \renewcommand{\@arrow}[3][]{
+   \renewcommand{\@arrow@length@factor}{\@arrow@currentlength}
+   \setlength{\@arrow@length@actual}{\@arrow@currentlength\@arrow@length@default}
+   \ifthenelse{\equal{\@arrow@argument@both}{true}}{
+     \@mc@largernode{##2}{##3}
+   }{
+     \setlength{\@arrow@argument@width}{0pt}
+     \setlength{\@arrow@argument@height}{0pt}
+   }
+   \draw node[on chain=going \@arrow@currentdirection](\@arrow@currentname) {\tikz{
+     \@arrow@drawing
+     }
+   };
+   \@arrow@argument@anchor
+   \draw node[anchor=\@arrow@above@anchor,rotate=\@arrow@rotate,minimum width=\@arrow@argument@width, minimum height=\@arrow@argument@height]
+    at ($(@arrow@center.base)+(90+\@arrow@argument@angle:\@arrow@argument@aboveshift)$) {##2};
+   \draw node[anchor=\@arrow@below@anchor,rotate=\@arrow@rotate,minimum width=\@arrow@argument@width, minimum height=\@arrow@argument@height]
+    at ($(@arrow@center.base)+(-90+\@arrow@argument@angle:\@arrow@argument@belowshift)$) {##3};
+   \setlength{\@arrow@argument@aboveshift}{2pt}
+   \setlength{\@arrow@argument@belowshift}{2pt}
+  }
+}
+% ------------------------------------------------------------------------------------- %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ No newline at end of file