mychemistry (21dec12)

git-svn-id: svn://tug.org/texlive/trunk@28611 c570f23f-e606-0410-a88d-b1316a301751

4 files changed, 192 insertions, 170 deletions

diff --git a/Master/texmf-dist/doc/latex/mychemistry/README b/Master/texmf-dist/doc/latex/mychemistry/README
index 22a9229dcce..2fe11d7b08e 100644
--- a/Master/texmf-dist/doc/latex/mychemistry/README
+++ b/Master/texmf-dist/doc/latex/mychemistry/README
@@ -1,5 +1,5 @@
 --------------------------------------------------------------------------
-the MYCHEMISTRY package v1.99a 2012/09/20
+the MYCHEMISTRY package v1.99b 2012/12/19
 
   create reaction schemes with LaTeX and chemfig
 
diff --git a/Master/texmf-dist/doc/latex/mychemistry/mychemistry_en.pdf b/Master/texmf-dist/doc/latex/mychemistry/mychemistry_en.pdf
index a4c7efedbcb..daffa005e0e 100644
--- a/Master/texmf-dist/doc/latex/mychemistry/mychemistry_en.pdf
+++ b/Master/texmf-dist/doc/latex/mychemistry/mychemistry_en.pdf
diff --git a/Master/texmf-dist/doc/latex/mychemistry/mychemistry_en.tex b/Master/texmf-dist/doc/latex/mychemistry/mychemistry_en.tex
index bc8c52207a7..269b8fecbfd 100644
--- a/Master/texmf-dist/doc/latex/mychemistry/mychemistry_en.tex
+++ b/Master/texmf-dist/doc/latex/mychemistry/mychemistry_en.tex
@@ -51,6 +51,8 @@
 \usepackage{booktabs}
 \usepackage{siunitx}
 
+\chemsetup[chemformula]{format=\libertineLF}
+
 \addcmds{
   @addtoreset,
   anywhere,
@@ -142,12 +144,12 @@ TikZ-libraries \code{arrows}, \code{positioning}, \code{decorations.pathmorphing
 \code{shapes}, \code{calc}, \code{matrix}, \code{chains}, \code{scopes} and
 \code{intersections}.
 
-If the package is available \mychemistry also loads \paket*{translator}\footnote{%
-Part of the \paket*{beamer} bundle}.
+\mychemistry also loads \paket*{translations}\footnote{Part of the
+\paket*{exsheets} package} for proper language support.
 
 \section{Changes}
 With v1.99 (=v2.0beta) package dependencies have changed so that \mychemistry
-loads noticably less packages than before. Most important for you: it does not
+loads noticably less packages than before. Most important for you: it does \emph{not}
 load \paket{mhchem} any more. This documentation uses \paket{chemmacros} instead
 which is loaded by \mychemistry.
 
@@ -169,10 +171,11 @@ which then rapidly grew and until now has its users.
 
 The background has changed in August 2011, though. Then \paket{chemfig} v1.0 was
 published and now provides simple but powerful macros to create reactions schemes.
-They seem to to be used very often but I am advertising as much as I can. Anyway,
-since then \mychemistry can be considered obsolete and is not actively developed
-any more. The current release 1.99 (= 2.0beta) was due to an incompatibilty with
-\paket{pdfpages} and a complete robustification of various parts of the code.
+They don't seem to to be used very often but I am advertising as much as I can.
+Anyway, since then \mychemistry can be considered obsolete and is not actively
+developed any more. The current release 1.99 (= 2.0beta) was due to an
+incompatibilty with \paket{pdfpages} and a complete robustification of various
+parts of the code.
 
 \emph{Other than bug fixes this package will very likely \emph{not} be updated
 any more}!
@@ -419,7 +422,7 @@ branch continue the original chain.
 
 The chain is broken by the branch which starts a new chain itself.
 \begin{rxn}
- \tikzset{nummer/.style={circle,fill=gray!30,draw=gray,minimum size=3.5mm}}
+ \tikzset{nummer/.style={circle,fill=gray!30,draw=gray,minimum size=3.5mm,overlay}}
  \reactant[,a]{A}\arrow[,,,pa]{}{}\reactant[,b]{B}
  \branch[a.-90]{
    \arrow[-90,,,pb]{}{}\reactant[-90,c]{C}
@@ -762,13 +765,13 @@ in the right order, separated with commas.
   \setarrowlength{2.5em}
   \dummy[a]
   \arrow{}{}\reactant{right = \ang{0}}
-  \branch[above right=of a]{\arrow[above right]{}{}\reactant[above right]{above right = \ang{45}}}
-  \branch[above=of a]{\arrow[above]{}{}\reactant[above]{above = \ang{90}}}
-  \branch[above left=of a]{\arrow[above left]{}{}\reactant[above left]{above left = \ang{135}}}
-  \branch[left=of a]{\arrow[left]{}{}\reactant[left]{left = \ang{180} = \ang{-180}}}
-  \branch[below left=of a]{\arrow[below left]{}{}\reactant[below left]{below left = \ang{225} = \ang{-135}}}
-  \branch[below=of a]{\arrow[below]{}{}\reactant[below]{below = \ang{270} = \ang{-90}}}
-  \branch[below right=of a]{\arrow[below right]{}{}\reactant[below right]{below right = \ang{315} = \ang{-45}}}
+  \branch[above right=of a]{\arrow[above right]{}{}\reactant[above right,,overlay]{above right = \ang{45}}}
+  \branch[above=of a]{\arrow[above]{}{}\reactant[above,,overlay]{above = \ang{90}}}
+  \branch[above left=of a]{\arrow[above left]{}{}\reactant[above left,,overlay]{above left = \ang{135}}}
+  \branch[left=of a]{\arrow[left]{}{}\reactant[left,,overlay]{left = \ang{180} = \ang{-180}}}
+  \branch[below left=of a]{\arrow[below left]{}{}\reactant[below left,,overlay,xshift=-2em]{below left = \ang{225} = \ang{-135}}}
+  \branch[below=of a]{\arrow[below]{}{}\reactant[below,,overlay]{below = \ang{270} = \ang{-90}}}
+  \branch[below right=of a]{\arrow[below right]{}{}\reactant[below right,,overlay,xshift=2em]{below right = \ang{315} = \ang{-45}}}
  \end{rxn}
  Additionally you can use every angle from the interval $[\ang{-360};\ang{360}]$.
  
diff --git a/Master/texmf-dist/tex/latex/mychemistry/mychemistry.sty b/Master/texmf-dist/tex/latex/mychemistry/mychemistry.sty
index 6d595e3df45..089ac37b854 100644
--- a/Master/texmf-dist/tex/latex/mychemistry/mychemistry.sty
+++ b/Master/texmf-dist/tex/latex/mychemistry/mychemistry.sty
@@ -28,7 +28,7 @@
 % This work consists of the files mychemistrysty, mychemistry_en.tex,
 % README and the derived file mychemistry_en.pdf.
 % --------------------------------------------------------------------------
-\ProvidesPackage{mychemistry}[2012/09/20 v1.99a create reaction schemes with LaTeX and chemfig]
+\ProvidesPackage{mychemistry}[2012/12/19 v1.99b create reaction schemes with LaTeX and chemfig]
 \RequirePackage{etoolbox,float,xkeyval,chemfig,chemmacros}
 \usetikzlibrary{
   arrows,
@@ -159,26 +159,14 @@
 \mCh@new@variable\rs@name
 \mCh@set@variable\rs@name{Reaction scheme}
 
-\IfFileExists{translator.sty}{%
-  \RequirePackage{translator}
-  \usedictionary{translator-basic-dictionary}
-  \languagealias{ngerman}{German}
-  \languagealias{german}{German}
-  \languagealias{austrian}{German}
-  \languagealias{naustrian}{German}
-  \languagealias{french}{French}
-  \languagealias{canadien}{French}
-  \languagealias{italian}{Italian}
-  \languagealias{spanish}{Spanish}
-  \providetranslation[to=English]{reaction-scheme-(caption-title)}{Reaction scheme}
-  \providetranslation[to=BritishEnglish]{reaction-scheme-(caption-title)}{Reaction scheme}
-  \providetranslation[to=AmericanEnglish]{reaction-scheme-(caption-title)}{Reaction scheme}
-  \providetranslation[to=French]{reaction-scheme-(caption-title)}{Sch\'{e}ma r\'{e}actionnel}
-  \providetranslation[to=German]{reaction-scheme-(caption-title)}{Reaktionsschema}
-  \providetranslation[to=Italian]{reaction-scheme-(caption-title)}{Reazione Scheme}
-  \providetranslation[to=Spanish]{reaction-scheme-(caption-title)}{Esquema de Reacci\'{o}n}
-  \mCh@set@variable\rs@name{\translate{reaction-scheme-(caption-title)}}
-}{}
+\RequirePackage{translations}
+\NewTranslation{English} {reaction-scheme-(caption-title)} {Reaction scheme}
+\NewTranslation{French}  {reaction-scheme-(caption-title)} {Sch\'{e}ma r\'{e}actionnel}
+\NewTranslation{German}  {reaction-scheme-(caption-title)} {Reaktionsschema}
+\NewTranslation{Italian} {reaction-scheme-(caption-title)} {Reazione Scheme}
+\NewTranslation{Spanish} {reaction-scheme-(caption-title)} {Esquema de Reacci\'{o}n}
+\mCh@set@variable\rs@name{\GetTranslation{reaction-scheme-(caption-title)}}
+
 
 % --------------------------------------------------------------------------
 % Direction Analysis
@@ -1077,77 +1065,89 @@
 % REAKTANDEN
 % Standardreaktand
 % \reactant[<pos>,<name>,<tikz>]{<something>}
-\newrobustcmd\mCh@reactant[2][]{%
-  \ifblank{#1}
-    {\mCh@reactant@i}{\mCh@reactant@ii[#1]}
-  {#2}}
+\def\mCh@argument@safe{\@makeother\#}
+
+\newrobustcmd\mCh@reactant[1][]{%
+  \begingroup
+    \mCh@argument@safe
+    \ifblank{#1}
+      {\mCh@reactant@i}
+      {\mCh@reactant@ii[#1]}%
+}
 
 \mCh@def\mCh@reactant@i#1{%
-  \expandafter\node\expandafter[%
-    \mCh@reactant@visible,
-    on chain=going {at=(\tikzchainprevious.0)},
-    anchor=180,
-    shift=(0:\mCh@rxn@node@distance)]{\scantokens{\relax#1}};
+    \expandafter\node\expandafter[%
+      \mCh@reactant@visible,
+      on chain=going {at=(\tikzchainprevious.0)},
+      anchor=180,
+      shift=(0:\mCh@rxn@node@distance)]{#1};
+  \endgroup
 }
 
 \mCh@def\mCh@reactant@ii[#1]#2{%
-  \let\mCh@remainargs\@empty\mCh@splitarg{#1}%
-  \mCh@ifempty@variable\firstarg{% erste Option: <pos>, zweite Option: <name>, dritte Option: <tikz>
-    \mCh@set@variable\angle{0}%
-    \mCh@set@variable\anchor{180}%
-    \mCh@empty@variable\referred@node
-  }{%
-    \expandafter\mCh@analyze@angle\expandafter{\mCh@firstarg}%
-    \mCh@set@variable\anchor{180+\mCh@angle}%
-  }%
-  \mCh@ifempty@variable\referred@node
-    {\mCh@set@variable\referred@node{\tikzchainprevious}}{}%
-  \expandafter\expandafter\expandafter\node\expandafter\expandafter\expandafter[%
-    \expandafter\mCh@thirdarg\expandafter,%
-    \mCh@reactant@visible,
-    on chain=going {at=(\mCh@referred@node.\mCh@angle)},
-    anchor=\mCh@anchor,shift=(\mCh@angle:\mCh@rxn@node@distance)]
-    (\mCh@secondarg){\scantokens{\relax#2}};
+    \let\mCh@remainargs\@empty\mCh@splitarg{#1}%
+    \mCh@ifempty@variable\firstarg{% erste Option: <pos>, zweite Option: <name>, dritte Option: <tikz>
+      \mCh@set@variable\angle{0}%
+      \mCh@set@variable\anchor{180}%
+      \mCh@empty@variable\referred@node
+    }{%
+      \expandafter\mCh@analyze@angle\expandafter{\mCh@firstarg}%
+      \mCh@set@variable\anchor{180+\mCh@angle}%
+    }%
+    \mCh@ifempty@variable\referred@node
+      {\mCh@set@variable\referred@node{\tikzchainprevious}}{}%
+    \expandafter\expandafter\expandafter\node\expandafter\expandafter\expandafter[%
+      \expandafter\mCh@thirdarg\expandafter,%
+      \mCh@reactant@visible,
+      on chain=going {at=(\mCh@referred@node.\mCh@angle)},
+      anchor=\mCh@anchor,shift=(\mCh@angle:\mCh@rxn@node@distance)]
+      (\mCh@secondarg){#2};
+  \endgroup
 }
 
 % Mesomerie
 % \mesomeric[<pos>,<name>,<tikz>]{<something>}
-\newrobustcmd\mCh@mesomeric[2][]{%
-  \ifblank{#1}
-    {\mCh@mesomeric@i}{\mCh@mesomeric@ii[#1]}
-  {#2}}
+\newrobustcmd\mCh@mesomeric[1][]{%
+  \begingroup
+    \mCh@argument@safe
+    \ifblank{#1}
+      {\mCh@mesomeric@i}
+      {\mCh@mesomeric@ii[#1]}%
+}
 
 \mCh@def\mCh@mesomeric@i#1{%
-  \node[on chain=going {at=(\tikzchainprevious.0),
-    shift=($(0:\mCh@rxn@node@distance)$)},
-    anchor=180,shift=(0:\mCh@rxn@node@distance),
-    inner sep=1pt,
-    left delimiter={[},
-    right delimiter={]}]
-    {\tikzpicture[start branch]\scantokens{\relax#1}\endtikzpicture};
+    \node[on chain=going {at=(\tikzchainprevious.0),
+      shift=($(0:\mCh@rxn@node@distance)$)},
+      anchor=180,shift=(0:\mCh@rxn@node@distance),
+      inner sep=1pt,
+      left delimiter={[},
+      right delimiter={]}]
+      {\tikzpicture[start branch]#1\endtikzpicture};
+  \endgroup
 }
 
 \mCh@def\mCh@mesomeric@ii[#1]#2{%
-  \let\mCh@remainargs\@empty
-  \mCh@splitarg{#1}%
-  \mCh@ifempty@variable\firstarg{% erste Option: <pos>, zweite Option: <name>, dritte Option: <tikz>
-    \mCh@set@variable\angle{0}%
-    \mCh@set@variable\anchor{180}%
-    \mCh@empty@variable\referred@node
-  }{%
-    \expandafter\mCh@analyze@angle\expandafter{\mCh@firstarg}%
-    \mCh@set@variable\anchor{180+\mCh@angle}%
-  }%
-  \mCh@ifempty@variable\referred@node
-    {\mCh@set@variable\referred@node{\tikzchainprevious}}{}%
-  \expandafter\node\expandafter[\mCh@thirdarg,
-    on chain=going {at=(\mCh@referred@node.\mCh@angle)},
-    anchor=\mCh@anchor,
-    shift=(\mCh@angle:\mCh@rxn@node@distance),
-    inner sep=1pt,
-    left delimiter={[},
-    right delimiter={]}]
-    (\mCh@secondarg){\tikzpicture[start branch]\scantokens{\relax#2}\endtikzpicture};
+    \let\mCh@remainargs\@empty
+    \mCh@splitarg{#1}%
+    \mCh@ifempty@variable\firstarg{% erste Option: <pos>, zweite Option: <name>, dritte Option: <tikz>
+      \mCh@set@variable\angle{0}%
+      \mCh@set@variable\anchor{180}%
+      \mCh@empty@variable\referred@node
+    }{%
+      \expandafter\mCh@analyze@angle\expandafter{\mCh@firstarg}%
+      \mCh@set@variable\anchor{180+\mCh@angle}%
+    }%
+    \mCh@ifempty@variable\referred@node
+      {\mCh@set@variable\referred@node{\tikzchainprevious}}{}%
+    \expandafter\node\expandafter[\mCh@thirdarg,
+      on chain=going {at=(\mCh@referred@node.\mCh@angle)},
+      anchor=\mCh@anchor,
+      shift=(\mCh@angle:\mCh@rxn@node@distance),
+      inner sep=1pt,
+      left delimiter={[},
+      right delimiter={]}]
+      (\mCh@secondarg){\tikzpicture[start branch]#2\endtikzpicture};
+  \endgroup
 }
 
 % Mesomerie-Pfeil
@@ -1158,29 +1158,36 @@
 % \anywhere{<pos>,<name>,<tikz>}{<something>}
 \mCh@new@variable\anywhere@positioning
 
-\newrobustcmd\mCh@anywhere[2]{%
-  \let\mCh@remainargs\@empty
-  \mCh@splitarg{#1}% erste Option: <pos>, zweite Option: <name>, dritte Option: <tikz>
-  \mCh@ifempty@variable\firstarg{%
-    \mCh@error{\string\anywhere: positioning missing}{}%
-  }{%
-    \expandafter\mCh@if@instr\expandafter{\mCh@firstarg}{=}{%
-      \mCh@xset@variable\anywhere@positioning{\mCh@firstarg}%
+\newrobustcmd\mCh@anywhere[1]{%
+  \begingroup
+    \mCh@argument@safe
+    \let\mCh@remainargs\@empty
+    \mCh@splitarg{#1}% erste Option: <pos>, zweite Option: <name>, dritte Option: <tikz>
+    \mCh@ifempty@variable\firstarg{%
+      \mCh@error{\string\anywhere: positioning missing}{}%
     }{%
-      \expandafter\mCh@analyze@angle\expandafter{\mCh@firstarg}%
-      \mCh@set@variable\anchor{180+\mCh@angle}%
-      \mCh@ifempty@variable\referred@node{%
-        \mCh@error{You can't use `angle' to position \string\anywhere.
-        You need to use `name.angle'}%
+      \expandafter\mCh@if@instr\expandafter{\mCh@firstarg}{=}{%
+        \mCh@xset@variable\anywhere@positioning{\mCh@firstarg}%
       }{%
-        \mCh@set@variable\anywhere@positioning{%
-          at=(\mCh@referred@node.\mCh@angle),anchor=\mCh@anchor}%
+        \expandafter\mCh@analyze@angle\expandafter{\mCh@firstarg}%
+        \mCh@set@variable\anchor{180+\mCh@angle}%
+        \mCh@ifempty@variable\referred@node{%
+          \mCh@error{You can't use `angle' to position \string\anywhere.
+          You need to use `name.angle'}%
+        }{%
+          \mCh@set@variable\anywhere@positioning{%
+            at=(\mCh@referred@node.\mCh@angle),anchor=\mCh@anchor}%
+        }%
       }%
     }%
-  }%
-  \expandafter\expandafter\expandafter\node\expandafter\expandafter\expandafter[%
-    \expandafter\mCh@thirdarg\expandafter,%
-    \mCh@anywhere@positioning](\mCh@secondarg){#2};
+    \mCh@anywhere@i
+}
+
+\mCh@def\mCh@anywhere@i#1{%
+    \expandafter\expandafter\expandafter\node\expandafter\expandafter\expandafter[%
+      \expandafter\mCh@thirdarg\expandafter,%
+      \mCh@anywhere@positioning](\mCh@secondarg){#1};
+  \endgroup
 }
 
 % Dummy
@@ -1194,51 +1201,58 @@
 % \transition[<pos>,<name>,<tikz>]{<something>}
 \mCh@new@variable\transition@name
 
-\newrobustcmd\mCh@transition[2][]{%
-  \ifblank{#1}
-    {\mCh@transition@i}{\mCh@transition@ii[#1]}
-  {#2}}
+\newrobustcmd\mCh@transition[1][]{%
+  \begingroup
+    \mCh@argument@safe
+    \ifblank{#1}
+      {\mCh@transition@i}
+      {\mCh@transition@ii[#1]}%
+}
 
 \mCh@def\mCh@transition@i#1{%
-  \expandafter\node\expandafter[\mCh@reactant@visible,
-    on chain=going {at=(\tikzchainprevious.0)},
-    anchor=180,
-    shift=(0:\mCh@rxn@node@distance),
-    anchor=180,
-    inner sep=3pt,
-    left delimiter={[},
-    right delimiter={]}]
-    (mCh@transition@name){\scantokens{\relax#1}};
-  \node at ($(mCh@transition@name.north east)+(.7em,0)$) {$\transitionstatesymbol$};
+    \expandafter\node\expandafter[\mCh@reactant@visible,
+      on chain=going {at=(\tikzchainprevious.0)},
+      anchor=180,
+      shift=(0:\mCh@rxn@node@distance),
+      anchor=180,
+      inner sep=3pt,
+      left delimiter={[},
+      right delimiter={]}]
+      (mCh@transition@name){#1};
+    \node at ($(mCh@transition@name.north east)+(.7em,0)$)
+      {$\transitionstatesymbol$};
+  \endgroup
 }
 
 \mCh@def\mCh@transition@ii[#1]#2{%
-  \let\mCh@remainargs\@empty
-  \mCh@splitarg{#1}%
-  \mCh@ifempty@variable\firstarg{% erste Option: <pos>
-    \mCh@set@variable\angle{0}%
-    \mCh@set@variable\anchor{180}%
-    \mCh@empty@variable\referred@node
-  }{%
-    \expandafter\mCh@analyze@angle\expandafter{\mCh@firstarg}%
-    \mCh@set@variable\anchor{180+\mCh@angle}%
-  }%
-  \mCh@ifempty@variable\secondarg% zweite Option: <name>, dritte Option: <tikz>
-    {\mCh@set@variable\transition@name{mCh@transition@name}}
-    {\mCh@let@variable\transition@name\secondarg}%
-  \mCh@ifempty@variable\referred@node
-    {\mCh@set@variable\referred@node{\tikzchainprevious}}{}%
-  \expandafter\expandafter\expandafter\node\expandafter\expandafter\expandafter[%
-    \mCh@reactant@visible\expandafter,%
-    \mCh@thirdarg,
-    on chain=going {at=(\mCh@referred@node.\mCh@angle)},
-    anchor=\mCh@anchor,
-    shift=(\mCh@angle:\mCh@rxn@node@distance),
-    inner sep=3pt,
-    left delimiter={[},
-    right delimiter={]}]
-    (\mCh@transition@name){\scantokens{\relax#2}};
-  \node at ($(\mCh@transition@name.north east)+(.7em,0)$) {$\transitionstatesymbol$};
+    \let\mCh@remainargs\@empty
+    \mCh@splitarg{#1}%
+    \mCh@ifempty@variable\firstarg{% erste Option: <pos>
+      \mCh@set@variable\angle{0}%
+      \mCh@set@variable\anchor{180}%
+      \mCh@empty@variable\referred@node
+    }{%
+      \expandafter\mCh@analyze@angle\expandafter{\mCh@firstarg}%
+      \mCh@set@variable\anchor{180+\mCh@angle}%
+    }%
+    \mCh@ifempty@variable\secondarg% zweite Option: <name>, dritte Option: <tikz>
+      {\mCh@set@variable\transition@name{mCh@transition@name}}
+      {\mCh@let@variable\transition@name\secondarg}%
+    \mCh@ifempty@variable\referred@node
+      {\mCh@set@variable\referred@node{\tikzchainprevious}}{}%
+    \expandafter\expandafter\expandafter\node\expandafter\expandafter\expandafter[%
+      \mCh@reactant@visible\expandafter,%
+      \mCh@thirdarg,
+      on chain=going {at=(\mCh@referred@node.\mCh@angle)},
+      anchor=\mCh@anchor,
+      shift=(\mCh@angle:\mCh@rxn@node@distance),
+      inner sep=3pt,
+      left delimiter={[},
+      right delimiter={]}]
+      (\mCh@transition@name){#2};
+    \node at ($(\mCh@transition@name.north east)+(.7em,0)$)
+      {$\transitionstatesymbol$};
+  \endgroup
 }
 
 % Abzweigung
@@ -1250,21 +1264,24 @@
 %        <name>.<angle> (sitzt nicht auf der Kette)
 \mCh@new@variable\branch@positioning
 
-\newrobustcmd\mCh@branch[2][]{%
-  \ifblank{#1}
-    {\mCh@branch@i}{\mCh@branch@ii[#1]}
-  {#2}}
+\newrobustcmd\mCh@branch[1][]{%
+  \begingroup
+    \mCh@argument@safe
+    \ifblank{#1}
+      {\mCh@branch@i}
+      {\mCh@branch@ii[#1]}%
+}
 
-\mCh@def\mCh@branch@i#1{%
+\mCh@def\mCh@branch@i{%
   \expandafter\mCh@set@variable\expandafter\branch@positioning\expandafter{\mCh@branch@visible,
     on chain=going {at=(\tikzchainprevious.0)},
     anchor=180,
     shift=(0:\mCh@rxn@node@distance)}%
   \mCh@empty@variable\secondarg
   \mCh@empty@variable\thirdarg
-  \mCh@branch@iii{#1}}
+  \mCh@branch@iii}
 
-\mCh@def\mCh@branch@ii[#1]#2{%
+\mCh@def\mCh@branch@ii[#1]{%
   \let\mCh@remainargs\@empty
   \mCh@splitarg{#1}% erste Option: <pos>, zweite Option: <name>, dritte Option: <tikz>
   \mCh@ifempty@variable\firstarg{%
@@ -1291,15 +1308,16 @@
       }%
     }%
   }%
-  \mCh@branch@iii{#2}}
+  \mCh@branch@iii}
 
 \mCh@def\mCh@branch@iii#1{%
-  \expandafter\expandafter\expandafter\node\expandafter\expandafter\expandafter[%
-    \expandafter\mCh@branch@positioning\expandafter,%
-    \mCh@thirdarg]
-    (\mCh@secondarg){\tikzpicture[start branch]\scantokens{\relax#1}\endtikzpicture};}%
-    % scantokens nötig, da sonst eine Dreifachbindung ~ vor () mit falschem
-    % catcode interpretiert wird
+    \expandafter\expandafter\expandafter\node\expandafter\expandafter\expandafter[%
+      \expandafter\mCh@branch@positioning\expandafter,%
+      \mCh@thirdarg]
+      (\mCh@secondarg){\tikzpicture[start branch]#1\endtikzpicture};
+  \endgroup
+}%
+
 
 % --------------------------------------------------------------------------
 % Sonstiges
@@ -1507,7 +1525,7 @@ HISTORY:
                          - synonym to \reactand=\reactant added
                          - rxn & rxnscheme rewritten
                          - commands \reactant, \mesomeric, \branch & \transition
-                           modified: argument is set with \scantokens{\relax#1},
+                           modified: argument is set with \mCh@argument@safe{#1},
                            so the chemfig catcode regime is working properly
                            before () (else possible problem with triple bond ~)
                          - syntax of \arrow changed so it fits to the syntax of
@@ -1533,6 +1551,7 @@ HISTORY:
                            packages; \merge is also only defined inside the scheme
                            environments
 2012/09/20 version 1.99a - small adjustments to \elmove
+2012/12/19 version 1.99b - changed catcode regime (# is read with catcode 12)
+                           so that chemfig's bond offset works
                            
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