From 8f0c39ea0736ec81b5d289f9699c5343cc3c88e3 Mon Sep 17 00:00:00 2001
From: Karl Berry <karl@freefriends.org>
Date: Sun, 7 Jun 2009 23:22:28 +0000
Subject: chemstyle 2 (6jun09)

git-svn-id: svn://tug.org/texlive/trunk@13659 c570f23f-e606-0410-a88d-b1316a301751
---
 .../source/latex/chemstyle/chemscheme.dtx          | 1998 --------------------
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diff --git a/Master/texmf-dist/source/latex/chemstyle/chemscheme.dtx b/Master/texmf-dist/source/latex/chemstyle/chemscheme.dtx
deleted file mode 100644
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--- a/Master/texmf-dist/source/latex/chemstyle/chemscheme.dtx
+++ /dev/null
@@ -1,1998 +0,0 @@
-% \iffalse meta-comment
-%
-% Copyright (C) 2007-08 by
-%    Joseph Wright <joseph.wright@morningstar2.co.uk>
-%
-% 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 2003/12/01 or later.
-%
-% This work has the LPPL maintenance status `maintained.'
-%
-% The current maintainer of this work is Joseph Wright.
-%
-% This work consists of the source file chemscheme.dtx and
-%                                       chemscheme.cdx
-%                 and the derived files chemscheme.ins,
-%                                       chemscheme.sty,
-%                                       chemscheme.pdf,
-%                                       chemscheme-manual.pdf,
-%                                       chemscheme-demo.ltx,
-%                                       scheme-one.eps,
-%                                       scheme-two.eps,
-%                                       jawltxdoc.sty and
-%
-% TDS-ready files:
-%    The compressed file chemscheme.tds.zip contains an unpacked
-%    version of all of the files included here, and pre-compiled
-%    documentation in PDF format.  Simply decompress
-%    chemscheme.tds.dtx in your local TeX directory, run your hash
-%    program (texhash, initexmf --update-fndb, etc.) and everything
-%    will be ready to go.  The user documentation for the package is
-%    called chemscheme-manual.pdf; the file chemscheme.pdf includes
-%    the user manual and the fully-indexed source code.
-%
-% Unpacking:
-%    (a) If chemscheme.ins is present:
-%           tex chemscheme.ins
-%    (b) Without chemscheme.ins:
-%           tex chemscheme.dtx
-%    (c) If you use LaTeX to generate files:
-%           latex \let\install=y\input{chemscheme.dtx}
-%
-% Documentation:
-%    (a) Without write18 enabled:
-%          latex chemscheme.dtx
-%          (Comment out "inactive" line in driver where indicated)
-%          latex chemscheme.dtx
-%          dvips -o chemscheme-pics.ps chemscheme.dvi
-%          ps2pdf chemscheme-pics.ps
-%          bibtex8 --wolfgang chemscheme.aux
-%          makeindex -s gind.ist chemscheme.idx
-%          makeindex -s gglo.ist -o chemscheme.gls  chemscheme.glo
-%          pdflatex chemscheme.dtx
-%          pdflatex chemscheme.dtx
-%    (b) With write18 enabled:
-%          latex chemscheme.dtx
-%          (Comment out "inactive" line in driver where indicated)
-%          latex chemscheme.dtx
-%          pdflatex chemscheme.dtx
-%          pdflatex chemscheme.dtx
-%          pdflatex chemscheme.dtx
-%
-% Installation:
-%     Copy chemscheme.sty and the various .cfg files to a location
-%     searched by TeX, and if required by your TeX installation, run
-%     the appropriate command to build a hash of files (texhash,
-%     initexmf --update-fndb, etc.)
-%
-% Note:
-%     The jawltxdoc.sty file is not needed for installation,
-%     only for building the documentation; it may be deleted
-%     after producing the documentation (if necessary).
-%
-%<*ignore>
-% This is all taken verbatim from Heiko Oberdiek's packages
-\begingroup
-  \def\x{LaTeX2e}%
-\expandafter\endgroup
-\ifcase 0\ifx\install y1\fi\expandafter
-         \ifx\csname processbatchFile\endcsname\relax\else1\fi
-         \ifx\fmtname\x\else 1\fi\relax
-\else\csname fi\endcsname
-%</ignore>
-%<*install>
-\input docstrip.tex
-\keepsilent
-\askforoverwritefalse
-\preamble
- ----------------------------------------------------------------
- The chemstyle bundle --- Schemes and style for chemistry
- Maintained by Joseph Wright
- E-mail: joseph.wright@morningstar2.co.uk
- Released under the LaTeX Project Public License v1.3 or later
- See http://www.latex-project.org/lppl.txt
- ----------------------------------------------------------------
-
-\endpreamble
-\Msg{Generating chemscheme files:}
-\generate{\file{jawltxdoc.sty}{\from{\jobname.dtx}{jawltxdoc}}
-}
-\usedir{tex/latex/chemstyle}
-\generate{\file{\jobname.sty}{\from{\jobname.dtx}{package}}
-}
-\usedir{source/latex/chemstyle}
-\generate{\file{\jobname.ins}{\from{\jobname.dtx}{install}}
-}
-\nopreamble
-\usedir{doc/latex/chemstyle}
-\generate{\file{\jobname.bib}{\from{\jobname.dtx}{refs}}
-}
-\nopreamble\nopostamble
-\usedir{doc/latex/chemstyle}
-\generate{\file{scheme-one.eps}{\from{\jobname.dtx}{scheme}}
-          \file{scheme-two.eps}{\from{\jobname.dtx}{scheme,labels}}
-          \file{chemscheme-demo.ltx}{\from{\jobname.dtx}{demo}}
-}
-\endbatchfile
-%</install>
-%<*ignore>
-\fi
-% Will Robertson's trick
-\immediate\write18{bibtex8 --wolfgang \jobname}
-\immediate\write18{makeindex -s gind.ist -o \jobname.ind  \jobname.idx}
-\immediate\write18{makeindex -s gglo.ist -o \jobname.gls  \jobname.glo}
-\immediate\write18{dvips -o \jobname-pics.ps \jobname.dvi}
-\immediate\write18{ps2pdf \jobname-pics.ps}
-%</ignore>
-%<*driver>
-\PassOptionsToClass{a4paper}{article}
-\documentclass[german,english,UKenglish]{ltxdoc}
-\EnableCrossrefs
-\CodelineIndex
-\RecordChanges
-%\OnlyDescription
-\usepackage{jawltxdoc}
-% A bit of one-off trickery for this package
-% Use the method described in the documentation if you
-% want to compile this DTX using PDFLaTeX
-\usepackage[final
-% Comment out the next line when using PDFLaTeX after the initial
-% LaTeX run!
-%  ,inactive
-  ]{pst-pdf}
-\begin{document}
-  \DocInput{\jobname.dtx}
-\end{document}
-%</driver>
-% \fi
-%
-%\CheckSum{404}
-%
-% \CharacterTable
-%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
-%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
-%   Digits        \0\1\2\3\4\5\6\7\8\9
-%   Exclamation   \!     Double quote  \"     Hash (number) \#
-%   Dollar        \$     Percent       \%     Ampersand     \&
-%   Acute accent  \'     Left paren    \(     Right paren   \)
-%   Asterisk      \*     Plus          \+     Comma         \,
-%   Minus         \-     Point         \.     Solidus       \/
-%   Colon         \:     Semicolon     \;     Less than     \<
-%   Equals        \=     Greater than  \>     Question mark \?
-%   Commercial at \@     Left bracket  \[     Backslash     \\
-%   Right bracket \]     Circumflex    \^     Underscore    \_
-%   Grave accent  \`     Left brace    \{     Vertical bar  \|
-%   Right brace   \}     Tilde         \~}
-%
-% \GetFileInfo{\jobname.sty}
-%
-% \changes{v1.0}{2007/07/21}{Initial public release}
-% \changes{v1.1}{2007/08/05}{Added float centring code}
-% \changes{v1.2}{2007/08/18}{Removed \texttt{chapter} option}
-% \changes{v1.2}{2007/08/18}{Improved emulation of standard float
-%   types}
-%\changes{v1.2a}{2007/09/19}{License changed from GPL to LPPL}
-%\changes{v1.2a}{2007/09/19}{Documentation for PDF use added}
-%\changes{v1.3}{2007/10/04}{Improved French and German
-%  \texttt{babel} support}
-%\changes{v1.4}{2008/06/24}{Added support for \pkg{floatrow}}
-%
-%\setkeys{lst}{language=[LaTeX]{TeX},moretexcs={}}
-%
-%\DoNotIndex{\@arabic,\@chapter,\@ifclassloaded,\@ifnextchar}
-%\DoNotIndex{\@ifpackageloaded,\@ifundefined,\@ne,\@tempa,\@tempb}
-%\DoNotIndex{\@undefined,\‘,\addto,\addtocontents,\addtodef}
-%\DoNotIndex{\addvspace,\advance,\AtBeginDocument,\backmatter}
-%\DoNotIndex{\begin,\c@chapter,\caption,\captionsfrench}
-%\DoNotIndex{\captionsfrenchb,\captionsgerman,\captionsngerman}
-%\DoNotIndex{\centering,\cftsetindents,\CNlabel,\CNlabelsub}
-%\DoNotIndex{\compound,\counterwithin,\counterwithout,\csname}
-%\DoNotIndex{\DeclareNewFloatType,\DeclareVoidOption,\def}
-%\DoNotIndex{\define@key,\documentclass,\edef,\else,\end,\endcsname}
-%\DoNotIndex{\expandafter,\FB@makecaption,\fi,\floatname,\floatsetup}
-%\DoNotIndex{\ifartopt,\IfLanguageName,\ifnum,\ifx,\includegraphics}
-%\DoNotIndex{\insertchapterspace,\kill@lastcounter,\label}
-%\DoNotIndex{\languagename,\let,\listof,\lowercase,\MessageBreak}
-%\DoNotIndex{\NeedsTeXFormat,\newcommand,\newcount,\newcounter}
-%\DoNotIndex{\newfloat,\newif,\newlistentry,\newlistof,\p@}
-%\DoNotIndex{\PackageError,\PackageInfo,\PackageWarning}
-%\DoNotIndex{\ProcessKeyvalOptions,\protect,\ProvidesPackage}
-%\DoNotIndex{\psfrag,\raggedleft,\relax,\renewcommand}
-%\DoNotIndex{\RequirePackage,\scshape,\selectlanguage,\setcounter}
-%\DoNotIndex{\SetupKeyvalOptions,\space,\string,\textsf,\the}
-%\DoNotIndex{\thechapter,\usepackage,\z@}
-%
-% \title{\texttt{chemscheme} --- Support for chemical schemes%
-%   \thanks{This file describes version \fileversion, last revised
-%           \filedate.}}
-% \author{Joseph Wright%
-%   \thanks{E-mail: joseph.wright@morningstar2.co.uk}}
-% \date{Released \filedate}
-%
-% \maketitle
-%
-%\newcommand*{\flttype}[1]{\texttt{#1}}
-%\begin{abstract}
-% The \currpkg package consists of two parts, both related to
-% chemical schemes.  The package adds a \flttype{scheme} float type
-% to the \LaTeX\ default types \flttype{figure} and \flttype{table}.
-% The \flttype{scheme} float type acts in the same way as those
-% defined by the \LaTeX\ kernel,  but is intended for chemical
-% schemes.  The package also provides a method for adding automatic
-% chemical numbering to schemes.
-%\end{abstract}
-%
-%\begin{multicols}{2}
-%\tableofcontents
-%\end{multicols}
-%
-%\section{Introduction}
-% By default, \LaTeX\ defines two float types, \flttype{figure} and
-% \flttype{table}. Synthetic chemists make heavy use of schemes,
-% which need a \flttype{scheme} float type.  This is provided by
-% \currpkg, in a manner consistent with the kernel floats.
-%
-% Synthetic chemists also number compounds for ease of reference.
-% There are a number of \LaTeX\ packages which cover this area, most
-% notably \pkg{bpchem} and \pkg{chemcompounds}.  However, adding
-% numbers automatically to schemes is not covered by any existing
-% package. The \currpkg package seeks to rectify this.
-%\floatcontentscentre
-%
-%\section{Floating schemes}
-%\subsection{Basic use}
-%\DescribeEnv{scheme}
-% The package provides a new float type, scheme, accessed in the
-% usual way.
-%\begin{LaTeXexample}[float]
-%  \begin{scheme}[ht]
-%    \includegraphics{scheme-one}
-%    \caption{A scheme with no compound numbers.}
-%  \end{scheme}
-%\end{LaTeXexample}
-% The \flttype{scheme} float is designed to behave in the same way as
-% the standard \LaTeX\ float environments \flttype{figure} and
-% \flttype{table}.  Thus schemes will be placed at the top of a page,
-% where possible. As shown in the example, the use of positional
-% modifiers is allowed. Labelling and referencing schemes also
-% follows the \LaTeX\ conventions.  \currpkg works hard to emulate
-% the document class in use, and so the exact behaviour will depend
-% on whether the standard classes, \textsc{koma}-Script or
-% \pkg{memoir} are being used.
-%
-%\DescribeMacro{\listofschemes}
-%\DescribeMacro{\listschemename}
-% To match the \cs{listoffigures} and \cs{listoftables} macros
-% provided by the \LaTeX\ kernel, \currpkg provides a
-% \cs{listofschemes} command.  This works in the same way as the
-% kernel commands, with the default text stored in the macro
-% \cs{listschemename}.  Users upgrading from version 1.1 should note
-% the change of macro name (from \cs{listscheme}).  This is to bring
-% \currpkg into line with the \LaTeX\ kernel naming convention.  Also
-% notice that \cs{listofschemes} no longer accepts an optional
-% argument.  The standard output is illustrated below.
-%\begin{LaTeXexample}[resultonly]
-%  \listofschemes
-%\end{LaTeXexample}
-%
-%\subsection{Altering the defaults}
-%\DescribeOption{floats}
-% There are a number of methods available to generate new float
-% types. The \pkg{memoir} class can do this internally, or the
-% \pkg{float} or \pkg{floatrow} packages can be loaded to provide the
-% necessary system.  When \pkg{memoir} is used, \currpkg uses the
-% internal systems for generating new floats; for the standard
-% classes, \pkg{floatrow} is used by default.  The \opt{floats}
-% package option can be used to control which method is employed.
-% This uses the key--value system, can be given the values
-% \opt{float}, \opt{floatrow} or \opt{memoir}:
-%\begin{LaTeXexample}[noexample]
-%  \usepackage[floats=float]{chemscheme}
-%\end{LaTeXexample}
-% or
-%\begin{LaTeXexample}[noexample]
-%  \usepackage[floats=floatrow]{chemscheme}
-%\end{LaTeXexample}
-% or
-%\begin{LaTeXexample}[noexample]
-%  \usepackage[floats=memoir]{chemescheme}
-%\end{LaTeXexample}
-% The package will use the specified method if available (so
-% \opt{memoir} only works if using the \pkg{memoir} class!). If
-% either \pkg{float} or \pkg{floatrow} is loaded before \currpkg,
-% this forces the choice.
-%
-%\DescribeMacro{\schemename}
-% \cs{schemename} contains the text used in scheme captions (by
-% default \schemename).  This is used in the same manner as
-% \cs{figurename} or \cs{tablename} to set up the text used in scheme
-% captions.
-%\begin{LaTeXexample}[float]
-%  \renewcommand*{\schemename}{Illustration}
-%  \begin{scheme}[ht]
-%    \includegraphics{scheme-one}
-%    \caption{A scheme that is not a Scheme!}
-%  \end{scheme}
-%\end{LaTeXexample}
-%
-%
-%\subsection{\pkg{babel} support}
-% Schemes are provided with some support for \pkg{babel}.  Currently,
-% in addition to English, \currpkg provides alternatives for
-% \cs{schemename} and \cs{listschemename} in French and German. Users
-% of other languages are encouraged to supply suitable translations
-% for inclusion in future versions of \currpkg.
-%
-%\section{Horizontal positioning of all floats}
-%\DescribeMacro{\floatcontentscentre}
-%\DescribeMacro{\floatcontentscenter}
-%\DescribeMacro{\floatcontentsleft}
-%\DescribeMacro{\floatcontentsright}
-% The \LaTeX\ default is to position all float contents flush-left.
-% There is no ``hook'' provided to alter this.  The \currpkg package
-% therefore provides commands to align all float contents
-% automatically.  As the macro names make clear,
-% \cs{floatcontentscentre} will make all floats centred (for users
-% speaking U.S.~English, the alternative spelling
-% \cs{floatcontentscenter} is also available).  The default behaviour
-% is restored using the command \cs{floatcontentsleft}. Finally,
-% \cs{floatcontentsright} is provided  for use if needed. Notice that
-% the float positioning commands should be given \emph{outside}
-% floating environments, and apply to all subsequent floats.
-%\begin{LaTeXexample}[float]
-%  \floatcontentsleft
-%  \begin{scheme}[ht]
-%    \includegraphics{scheme-one}
-%    \caption{A flush-left scheme.}
-%  \end{scheme}
-%  \floatcontentsright
-%  \begin{scheme}[ht]
-%    \includegraphics{scheme-one}
-%    \caption{A flush-right scheme.}
-%  \end{scheme}
-%  \floatcontentscentre
-%\end{LaTeXexample}
-%
-% It is important to note that the positioning mechanism used here
-% relies on a low-level hack of the \LaTeX\ kernel.  This has been
-% tested with the standard \LaTeX\ classes, the \pkg{memoir} class
-% and the \textsc{koma}-Script bundled.  Other document classes may
-% not give the desired behaviour.
-%
-%\section{Reference numbers in graphics}
-%\subsection{Background}
-% There are a number of packages available on \CTAN\ for tracking
-% compound reference numbers.  The two with the most up to date and
-% comprehensive features are \pkg{bpchem} and \pkg{chemcompounds}.
-% Both allow in-text numbering to be handled automatically.  However,
-% neither will allow the use of these numbers directly in schemes,
-% figures, \etc.  Both leave it to the user to manually adapt schemes
-% to match any changes in numbering.
-%
-% The \currpkg package provides a mechanism for rectifying this
-% issue.  The package makes use of the \pkg{psfrag} package, which
-% means that it can only directly produce DVI output (using \LaTeX).
-% However, direct PDF output using PDF\LaTeX\ is possible: see
-% Section~\ref{subsec:pdf}.
-%
-%\DescribeMacro{\chemschemeref}
-%\DescribeMacro{\chemschemerefsub}
-% Users upgrading from v1.2 should note that ``\texttt{chem}'' has
-% been removed from the start of most macro names.  The main
-% referencing commands \cs{chemschemeref} and \cs{chemschemerefsub}
-% are retained for backward compatibility.
-%
-%\subsection{Usage}
-% Getting automated numbers into schemes is a two step procedure. In
-% the first step, schemes (or other graphics) should be prepared as
-% normal and saved as encapsulated postscript (EPS) files. The most
-% popular chemistry drawing package, \textsc{ChemDraw}, is able to do
-% this from the \texttt{Save As \ldots} dialog.
-%\DescribeMacro{\schemerefmarker}
-% The positions where the auto-labels should be have to be marked in
-% the EPS file. The marker should consist of an ``indicator'' that
-% the text is to be replaced, followed by a reference number or
-% letter.  For automated substitution, the ``indicator'' text should
-% be the same in all graphics; the value it is stored in
-% \cs{schemerefmarker}, and has default value
-% \textsf{\schemerefmarker}.  Thus the graphics should contain labels
-% \textsf{\schemerefmarker1}, \textsf{\schemerefmarker2}, \etc. A
-% suitable unmodified graphic is shown in in the next example.
-%\begin{LaTeXexample}[float]
-%  \begin{scheme}[ht]
-%    \includegraphics{scheme-two}
-%    \caption{A scheme with temporary compound numbers.}
-%  \end{scheme}
-%\end{LaTeXexample}
-% The value of \cs{schemerefmarker} may be altered as normal,
-% so for example to use \textsf{XXX} as the indicator for
-% replacement in all graphics, you would execute:
-%\begin{LaTeXexample}[noexample]
-%  \renewcommand*{\schemerefmarker}{XXX}
-%\end{LaTeXexample}
-%
-%\DescribeMacro{\schemeref}
-% In the second step, the command \cs{schemeref} is used to indicate
-% the mapping of the temporary markers to the automatically-managed
-% numbering. The syntax of the command is
-% \cs{chemschemeref}\oarg{temp-marker}\marg{label}, where
-% \meta{temp-marker} is the marker used in the graphic, and
-% \meta{label} is the name assigned to the compound by the user. By
-% default, \currpkg will assume that \meta{temp-marker} consists of
-% the marker plus a number, beginning at 1 and incrementing by 1 for
-% each additional structure inside one float. Each replacement
-% requires a separate \cs{chemschemeref}, all of which should appear
-% before the relevant \cs{includegraphics} command.
-%
-% An example will make usage clearer. In the example used in this
-% document, the starting material is given label \texttt{IMesHCl} and
-% the product is called \texttt{IMes}.  As is shown in the next
-% example, in the EPS file these are labelled \textsf{TMP1} and
-% \textsf{TMP2}, respectively. The automated package defaults are
-% used.
-%\begin{LaTeXexample}[float]
-%  \begin{scheme}[ht]
-%    \schemeref{IMesHCl}
-%    \schemeref{IMes}
-%    \includegraphics{scheme-two}
-%    \caption{A scheme with automated compound numbers.}
-%  \end{scheme}
-%\end{LaTeXexample}
-% With user-specified information on the text to be replaced, the
-% entire text to be matched must be given.\footnote{In this example,
-% this is redundant as the automated system will work fine.}
-%\begin{LaTeXexample}[float]
-%  \begin{scheme}[ht]
-%    \schemeref[TMP1]{IMesHCl}
-%    \schemeref[TMP2]{IMes}
-%    \includegraphics{scheme-two}
-%    \caption{A scheme with explicitly numbered temporary labels.}
-%  \end{scheme}
-%\end{LaTeXexample}
-% Notice that the new label is centred on the middle of the temporary
-% marker, with the same baseline.  This should allow the user to
-% obtain good alignment of labels and structures.
-%
-%\DescribeMacro{\schemerefsub}
-% As described in Section~\ref{packages}, \currpkg supports
-% \pkg{bpchem}, which allows tracking of sub-labels (\textbf{1a},
-% \textbf{1b}, \etc).  To allow use of these in schemes, the
-% \cs{schemerefsub} command is provided.  This takes an additional
-% argument \marg{sub-label}, which is used to generate the
-% appropriate text.  When used with \pkg{chemcompounds}, this command
-% will gobble its arguments and issue a warning; no substitution will
-% take place.
-%
-%\DescribeMacro{\schemerefformat}
-% The format of chemical references is controlled by the underlying
-% package, \pkg{bpchem} or \pkg{chemcompounds}.  However, it is
-% useful to be able to specify additional formatting for schemes.  By
-% default, \currpkg formats all reference numbers in a sans serif
-% font. This is controlled by \cs{schemerefformat}.
-%\begin{LaTeXexample}[float]
-%  % This needs the color or xcolor package loaded
-%  \renewcommand*{\schemerefformat}
-%    {\color{magenta}\textit}
-%  \begin{scheme}[ht]
-%    \schemeref{IMesHCl}
-%    \schemeref{IMes}
-%    \includegraphics{scheme-two}
-%    \caption{A scheme with altered label formatting.}
-%  \end{scheme}
-%\end{LaTeXexample}
-% The additional formatting applied within schemes may be altered by
-% redefining \cs{schemerefformat}.  By careful choice of the
-% font commands given here, good visual matching should be obtained
-% between the automatically-generated labels and other text in the
-% scheme.  In this document, the \textsc{ChemDraw} source uses 10
-% point Arial, with the \LaTeX\ sans serif font provided by the
-% \pkg{helvet} package, loaded scaled to 95\,\%, \ie:
-%\begin{LaTeXexample}[noexample]
-%  \usepackage[scaled=0.95]{helvet}
-%\end{LaTeXexample}
-% The \textsc{ChemDraw} file used to generate the example schemes is
-% included with the package as \file{chemscheme.cdx}.
-%
-%\iffalse
-%<*demo>
-%\fi
-%\subsection{\currpkg and
-%  \texorpdfstring{PDF\LaTeX}{PDFLaTeX}\label{subsec:pdf}}
-% The automatic substitution of numbers in graphics relies on the the
-% \pkg{psfrag} package.  This works with \textsc{PostScript} files,
-% and cannot therefore be used with PDF\LaTeX.  However, all is not
-% lost as the \pkg{pst-pdf} package provides a method for including
-% \textsc{PostScript} files in a PDF\LaTeX\ run.  However, this is
-% not automatic and some effort is needed by the user.\footnote{The
-% rest of this section is based closely on an example by Stefan
-% Pinnow.} The example below shows a example for using PDF\LaTeX\
-% with \currpkg.
-%    \begin{macrocode}
-\documentclass{article}
-\usepackage[T1]{fontenc}
-\usepackage{graphicx,chemscheme}
-% Remove `inactive' after the first LaTeX run
-\usepackage[inactive,final]{pst-pdf}
-\begin{document}
-\floatcontentscentre
-An example file for PDFLaTeX use.
-\begin{scheme}
-  \schemeref{IMesHCl}
-  \schemeref{IMes}
-  \includegraphics{scheme-two}
-  \caption{A scheme with automated compound numbers.}
-  \label{sc:scheme-one}
-\end{scheme}
-\end{document}
-%    \end{macrocode}
-%\iffalse
-%</demo>
-%\fi
-%
-% First you need to run the file through \LaTeX, so your package can
-% make the replacements in the picture. Then you need another run
-% through \LaTeX\ with the \opt{inactive} option \pkg{pst-pdf}
-% removed so that the modified pictures are extracted.\footnote{You
-% can simply do the first \LaTeX\ run without loading \pkg{pst-pdf}
-% at all, if you prefer.}  Do not worry that you end up with a very
-% odd looking DVI! Then you have to convert the extracted pictures to
-% PDF by the following commands
-%\begin{verbatim}
-%  dvips -o \jobname-pics.ps \jobname.dvi
-%  ps2pdf \jobname-pics.ps
-%\end{verbatim}
-% This converts the modified graphics into PDF format. After this,
-% you can use PDF\LaTeX\ as normal for your schemes. Notice that you
-% will have to repeat the process if you need to modify the schemes
-% or numbering in any way.
-%
-%\subsection{Managing chemical numbering\label{packages}}
-%\DescribeOption{bpchem}
-%\DescribeOption{chemcompounds}
-%\DescribeOption{tracking}
-% The \currpkg package can use one of two packages for management of
-% chemical numbering: \pkg{bpchem} and \pkg{chemcompounds}. As of
-% v1.3, \pkg{chemcompounds} is the default package for managing
-% reference numbers.\footnote{The change from \pkg{bpchem} is due to
-% issues with \pkg{hyperref} support.  The method used by
-% \pkg{bpchem} to generate compound labels means that they are made
-% into hyperlinks by \pkg{hyperref}, and therefore end up coloured
-% when using the \opt{colorlinks} option.  This is unlikely to be the
-% desired effect, and \pkg{chemcompounds} does not behave in this
-% way.} Both packages have advantages: \pkg{bpchem} allows the
-% tracking of sub-references (very common in organic chemistry),
-% whilst \pkg{chemcompounds} has a very well thought-out interface.
-% It is technically feasible to support both simultaneously, but this
-% is unlikely to have wide application. For this reason, \currpkg
-% loads only one package, and uses this package to provide numbering
-% management.  The \currpkg package recognises the \opt{bpchem} and
-% \opt{chemcompounds} to control this; the key--value version
-% \opt{tracking=\ldots} can also be given.
-%
-%\section{Generating chemical schemes}
-%
-%\subsection{Overview}
-% There are a number of ways of generating the graphical content of
-% schemes.  The choice of method will depend on what is available to
-% the user, and how complex the schemes desired are. In this section,
-% an overview of several approaches is given.\footnote{Thanks to
-% Norwid-R.\ Behrnd for suggesting this section and giving a number
-% of useful examples and tips.}  The package author, who is a
-% research worker in a university, favours using \textsc{ChemDraw} as
-% it is regarded by many synthetic chemists as the best tool for this
-% job.  However, this is clearly overkill for users requiring a
-% single diagram on a one-off basis. \textsc{ChemDraw} is also a
-% commercial package running only under Windows and the MacOS. The
-% following is necessarily somewhat brief and selective.  For a
-% thorough overview of graphics in \LaTeX, see Goossens
-% \etal~\cite{Goossens2007}.
-%
-%\subsection{Macro-based methods}
-% At the most basic, a chemical scheme is simply a collection of
-% lines and symbols, as with any vector diagram.  Hence, it is
-% possible to construct schemes directly using packages such as
-% PSTricks or \pkg{pgf}/Ti\emph{k}z.  This is a complex method, and
-% cannot be recommended for anyone except the very experienced and
-% brave.
-%
-% At a more practical level, there are two packages available which
-% allow typesetting of chemical structures in (La)\TeX, using
-% specialised commands: XyM\TeX\ and ppch\TeX.  Recent versions of
-% the XyM\TeX\ package have not been made available on \CTAN, and the
-% version held there is therefore considered to be obsolete.  On the
-% other hand, the ppch\TeX\ system, developed originally for
-% Con\TeX{}t, is available. Both systems suffer from the lack of
-% chemical logic in the input: it is very hard to tell from the code
-% what is being represented. Drawing items such as ``curly arrows'',
-% or making subtle alterations to positioning, is very challenging in
-% purely macro-based systems.  For these reasons, it is usually much
-% more sensible to examine the available graphical methods.
-%
-%\subsection{Graphical methods}
-% Moving to graphical systems, there is no reason that
-% general-purpose vector drawing packages cannot be used for schemes.
-% There are obviously several commercial (\textsc{CorelDraw},
-% \textsc{Adobe Illustrator}, \etc) and freeware (for example
-% the \textsc{gimp}) drawing packages that can be used in this way.
-% Simply rings and lines can easily be constructed, although in
-% general-purpose programs the user has to watch that all bonds
-% are the same length.
-%
-% For producing a large number of complex schemes, the particular
-% abilities of dedicated software become a necessity. As well as the
-% already-mentioned \textsc{ChemDraw}, programs such as \textsc{ISIS
-% Draw} and \textsc{ChemSketch} are available free for personal
-% use;\footnote{``Free'' as in without charge, not as in open
-% source.} these programs are all Windows specific.  In the
-% open-source arena, there are a number of packages such as
-% \textsc{XDrawChem} and \textsc{BKchem}, which offer cross-platform
-% functionality.  The differences between the various packages are in
-% the ease of use, and ability to generate well-formattd output (for
-% example, aligning structures).
-%
-% One which deserves mention for the \TeX\ user is TpX.  This is a
-% general purpose Windows graphics program specifically aimed at
-% producing \TeX-friendly output (such as PSTricks and \pkg{tikz}
-% code) from a graphical interface. TpX can accept clipboard data
-% from other programs, so can be used to produce EPS files from
-% programs which do not have native export facilities (such as
-% \textsc{ISIS Draw}).
-%
-%\section{Known issues}
-%
-% The interaction of the different document classes, with options,
-% plus the \pkg{babel} system means ensuring every possibility is
-% covered is impossible.  Users are asked to report any problems with
-% compatibility with other packages or emulation of the standard
-% float types.  Additional \pkg{babel} strings are also welcome, as
-% are improvements to those already provided.
-%
-% \StopEventually{\bibliographystyle{unsrt}\bibliography{chemscheme}}
-%
-% \iffalse
-%<*package>
-% \fi
-%
-% \section{Implementation}
-%
-% \subsection{Setup code}
-%\begin{macro}{\csh@id}
-% The initial code goes through the usual steps of identifying the
-% package.
-%    \begin{macrocode}
-\NeedsTeXFormat{LaTeX2e}
-\def\csh@id$#1: #2.#3 #4 #5-#6-#7 #8 #9${%
-    #5/#6/#7\space v1.4a\space}
-\ProvidesPackage{chemscheme}
-  [\csh@id $Id: chemscheme.dtx 48 2008-07-31 19:22:43Z joseph $
-   Support for chemical schemes]
-%    \end{macrocode}
-%\end{macro}
-%\changes{v1.4}{2008/06/19}{Option handling completely re-written}
-%\begin{macro}{\ifcsh@bpchem}
-% Package options are handled using the key--value method, with
-% \pkg{kvoptions} providing the back-end.  Most of the code here is
-% pretty basic; the aim is to set up the correct handling of
-% float-creation and compound tracking.
-%    \begin{macrocode}
-\RequirePackage{kvoptions,psfrag,iflang}
-\SetupKeyvalOptions{
-  family=csh,
-  prefix=csh@}
-\newif\ifcsh@bpchem
-\define@key{csh}{tracking}
-  {\csh@bpchemtrue
-   \lowercase{\edef\@tempa{#1}}%
-   \def\@tempb{bpchem}%
-   \ifx\@tempa\@tempb\else
-     \def\@tempb{chemcompounds}%
-     \ifx\@tempa\@tempb
-       \csh@bpchemfalse
-     \else
-       \PackageError{chemscheme}
-         {Unknown value `#1' for option numbers}
-         {The `tracking' option accepts values `bpchem'
-          and `chemcompounds'}%
-     \fi
-   \fi}
-\DeclareVoidOption{chemcompounds}{\csh@bpchemfalse}
-\DeclareVoidOption{bpchem}{\csh@bpchemtrue}
-\DeclareVoidOption{chapter}
-  {\PackageInfo{chemscheme}
-    {Ignoring obsolete option `chapter'}}
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\csh@fltpkg}
-% The provision of floats can be handled by \pkg{floatrow},
-% \pkg{float} or \pkg{memoir}.  The user is given an option, but if
-% one of the packages is already loaded then this has to be taken
-% into account.
-%    \begin{macrocode}
-\define@key{csh}{floats}
-  {\lowercase{\renewcommand*{\csh@fltpkg}{#1}}%
-   \def\@tempa{floatrow}%
-   \ifx\csh@fltpkg\@tempa\else
-     \def\@tempa{float}%
-     \ifx\csh@fltpkg\@tempa\else
-       \def\@tempa{memoir}%
-       \ifx\csh@fltpkg\@tempa
-         \@ifclassloaded{memoir}{}
-           {\PackageWarning{chemscheme}
-            {You asked for floats to be created using memoir,
-             \MessageBreak but have used a different document
-             class\MessageBreak Using floatrow instead}%
-            \renewcommand*{\csh@fltpkg}{floatrow}}%
-       \else
-         \PackageError{chemscheme}
-           {Unknown value `#1' for option numbers}
-           {The `floats' option accepts values `float',
-            `floatrow' and `memoir'}%
-       \fi
-     \fi
-   \fi}
-\@ifpackageloaded{floatrow}
-  {\newcommand*{\csh@fltpkg}{floatrow}%
-   \define@key{csh}{floats}
-     {\PackageInfo{chemscheme}{Package floatrow already
-      loaded\MessageBreak Option `floats' disabled}}}
-  {\@ifpackageloaded{float}
-     {\newcommand*{\csh@fltpkg}{float}%
-      \define@key{csh}{floats}
-        {\PackageInfo{chemscheme}{Package float already
-         loaded\MessageBreak Option `floats' disabled}}}
-     {\@ifclassloaded{memoir}
-        {\newcommand*{\csh@fltpkg}{memoir}}
-        {\newcommand*{\csh@fltpkg}{floatrow}}}}
-\ProcessKeyvalOptions{csh}
-%    \end{macrocode}
-%\end{macro}
-%\changes{v1.4}{2008/06/20}{Float creation rewritten}
-%\begin{macro}{\csh@load@memoir}
-%\begin{macro}{\csh@load@float}
-%\begin{macro}{\csh@load@floatrow}
-% The necessary support is loaded by using an appropriately-named
-% macro.  For \pkg{memoir}, nothing actually has to be done.
-%    \begin{macrocode}
-\newcommand*{\csh@load@memoir}{}
-\newcommand*{\csh@load@float}{%
-  \@ifpackageloaded{float}{}
-    {\let\newfloat\@undefined}
-  \RequirePackage{float,caption}}
-\newcommand*{\csh@load@floatrow}{%
-  \@ifpackageloaded{floatrow}{}
-    {\let\newfloat\@undefined}
-  \RequirePackage{floatrow,caption}}
-\csname csh@load@\csh@fltpkg\endcsname
-%    \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\subsection{Support for schemes}
-%\begin{macro}{\schemename}
-%\begin{macro}{\listschemename}
-%\changes{v1.2}{2007/08/18}{Replaces \cs{listschemes}}
-% The default name for a scheme, and the default title for the list
-% of schemes, are provided.  Both command names follow the kernel
-% conventions for figures and tables; unlike the kernel versions,
-% however, these macros are not \cs{long}.
-%    \begin{macrocode}
-\newcommand*{\schemename}{Scheme}
-\newcommand*{\listschemename}{List of Schemes}
-%    \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\begin{environment}{scheme}
-%\begin{macro}{\listofschemes}
-%\begin{macro}{\csh@makesch@memoir}
-%\begin{macro}{\csh@mksch@memoir}
-%\begin{macro}{\csh@makesch@float}
-%\begin{macro}{\csh@mksch@float}
-%\begin{macro}{\csh@makesch@floatrow}
-% As with package loading, three different macros are defined here to
-% create the new float type.  As well as the basics of creating the
-% float, some work is needed as adjustments must be made to match the
-% style of the kernel floats.  For the \pkg{floatrow} package, things
-% have to be done in the preamble, whereas for the others everything
-% happens later.
-%    \begin{macrocode}
-\newcommand*{\csh@makesch@memoir}{%
-  \AtBeginDocument{\csh@mksch@memoir}}
-\newcommand*{\csh@mksch@memoir}{%
-  \newfloat[chapter]{scheme}{los}{\schemename}
-  \kill@lastcounter{losdepth}
-  \renewcommand*{\thescheme}{\thechapter.\@arabic\c@scheme}
-  \addtodef{\@smemfront}{}{\counterwithout{scheme}{chapter}}
-  \addtodef{\@smemmain}{}{%
-    \ifartopt\else
-      \counterwithin{scheme}{chapter}
-    \fi}
-  \addtodef{\backmatter}{}{%
-    \ifartopt\else
-      \counterwithout{scheme}{chapter}%
-      \setcounter{scheme}{0}%
-    \fi}
-  \ifartopt
-    \counterwithout{scheme}{chapter}%
-  \fi
-  \newlistof{listofschemes}{los}{\listschemename}
-  \kill@lastcounter{losdepth}
-  \newlistentry[chapter]{scheme}{los}{0}
-  \cftsetindents{scheme}{0em}{2.3em}
-  \addtodef{\insertchapterspace}{}%
-    {\addtocontents{los}{\protect\addvspace{10pt}}}
-  \@ifundefined{c@losdepth}%
-    {\newcounter{losdepth}\setcounter{losdepth}{1}}{}}
-\newcommand*{\csh@makesch@float}{%
-  \AtBeginDocument{\csh@mksch@float}}
-\newcommand*{\csh@mksch@float}{%
-  \@ifundefined{chapter}
-    {\newfloat{scheme}{tbp}{los}}
-    {\newfloat{scheme}{tbp}{los}[chapter]%
-     \csh@fixchapter}%
-  \floatname{scheme}{\schemename}
-  \newcommand*{\listofschemes}{%
-    \listof{scheme}{\listschemename}}}
-%    \end{macrocode}
-%\changes{v1.4a}{2008/07/31}{Fixed bug with float definition, \pkg{floatrow}
-%  and chapters}
-% Using \pkg{floatrow}, the definition depends on whether chapters
-% are in use.
-%    \begin{macrocode}
-\newcommand*{\csh@makesch@floatrow}{%
-  \@ifundefined{chapter}
-    {\DeclareNewFloatType{scheme}
-      {fileext=los,placement=tbp,name=Scheme}}
-    {\DeclareNewFloatType{scheme}
-      {fileext=los,placement=tbp,name=Scheme,within=chapter}%
-     \csh@fixchapter}%
-  \newcommand*{\listofschemes}{%
-    \listof{scheme}{\listschemename}}}
-%    \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\begin{macro}{\csh@fixchapter}
-%\begin{macro}{\csh@chapter}
-%\begin{macro}{\@chapter}
-% When not using \pkg{memoir}, chapters may or may not be defined.
-% This means a little extra work.
-%    \begin{macrocode}
-\newcommand*{\csh@fixchapter}{%
-  \@ifundefined{KOMAScriptVersion}
-    {\renewcommand*{\thescheme}{%
-       \ifnum\c@chapter>\z@ \thechapter.\fi \@arabic\c@scheme}}
-    {}%
-    \let\csh@chapter\@chapter
-    \renewcommand{\@chapter}{%
-      \addtocontents{los}{\protect\addvspace{10\p@}}%
-      \csh@chapter}}
-%    \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-% The appropriate creation macro is now called.
-%    \begin{macrocode}
-\csname csh@makesch@\csh@fltpkg\endcsname
-%    \end{macrocode}
-%\end{macro}
-%\end{environment}
-%
-%\subsection{Positioning float contents}
-%\begin{macro}{\floatcontentscentre}
-%\begin{macro}{\floatcontentscenter}
-%\begin{macro}{\floatcontentsleft}
-%\begin{macro}{\floatcontentsright}
-% When using \pkg{floatrow}, centring all floats is easy.  This is
-% not the case for other methods, and so some macros are provided.
-% The definitions depend on whether \pkg{floatrow} is in use.
-%    \begin{macrocode}
-\def\@tempa{floatrow}
-\ifx\@tempa\csh@fltpkg
-  \newcommand*{\floatcontentscentre}{%
-    \floatsetup{objectset=centering}}
-  \newcommand*{\floatcontentscenter}{%
-    \floatsetup{objectset=centering}}
-  \newcommand*{\floatcontentsright}{%
-    \floatsetup{objectset=raggedleft}}
-  \newcommand*{\floatcontentsleft}{%
-    \floatsetup{objectset=raggedright}}
-%    \end{macrocode}
-%\begin{macro}{\csh@floatboxreset}
-%\begin{macro}{\@floatboxreset}
-%\begin{macro}{\csh@everyfloat}
-% When \pkg{floatrow} is not in use, then a low-level hack of
-% \cs{@floatboxtreset} is used.
-%    \begin{macrocode}
-\else
-  \let\csh@floatboxreset\@floatboxreset
-  \renewcommand*{\@floatboxreset}{%
-    \csh@everyfloat
-    \csh@floatboxreset}
-  \newcommand*{\floatcontentscentre}{%
-    \let\csh@everyfloat\centering}
-  \newcommand*{\floatcontentscenter}{%
-    \let\csh@everyfloat\centering}
-  \newcommand*{\floatcontentsleft}{%
-    \let\csh@everyfloat\relax}
-  \newcommand*{\floatcontentsright}{%
-    \let\csh@everyfloat\raggedleft}
-\fi
-\floatcontentsleft
-%    \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\subsection{\pkg{babel} support}
-%\begin{macro}{\ifcsh@babel}
-% To make the new float type work with \pkg{babel}, some alternative
-% text is provided for non-English users.  First, we need to know if
-% \pkg{babel} is loaded \emph{before} \currpkg or after, as this
-% affects one if the hacks needed for French.
-%    \begin{macrocode}
-\newif\ifcsh@babel
-\@ifpackageloaded{babel}
-  {\csh@babeltrue}
-  {}
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\floatc@plain}
-% There is then one hack to be made for French which has to be made
-% before the beginning of the document \emph{if} \pkg{babel} is
-% loaded before \currpkg.  This is only needed when \pkg{memoir} is
-% not in use.  So there is a run of tests to see if the conditions
-% for the hack are met.  \pkg{babel} support for French needs two
-% name checks, \emph{zut alors}!
-%    \begin{macrocode}
-\@ifclassloaded{memoir}{}
-  {\@ifpackageloaded{babel}
-     {\IfLanguageName{french}
-        {\let\floatc@plain\FB@makecaption}
-        {\IfLanguageName{frenchb}
-          {\let\floatc@plain\FB@makecaption}
-          {}}}
-  {}}
-%    \end{macrocode}
-%\end{macro}
-% The definition of new stings is delayed until the beginning of the
-% document, so that things work if \pkg{babel} is loaded after
-% \currpkg.  The multiple language names mean quite a bit of
-% repetition here.
-%    \begin{macrocode}
-\AtBeginDocument{
-  \@ifpackageloaded{babel}
-    {\addto{\captionsngerman}{%
-       \renewcommand*{\schemename}{Schema}}
-     \addto{\captionsngerman}{%
-       \renewcommand*{\listschemename}{Schemenverzeichnis}}
-     \addto{\captionsgerman}{%
-       \renewcommand*{\schemename}{Schema}}
-     \addto{\captionsgerman}{%
-       \renewcommand*{\listschemename}{Schemenverzeichnis}}
-%    \end{macrocode}
-% French settings.  \pkg{babel} also changes some style parameters here,
-% so \currpkg tries to match this.
-%    \begin{macrocode}
-     \addto{\captionsfrench}{%
-       \renewcommand*{\schemename}{\scshape Sch\`eme}}
-     \addto{\captionsfrench}{%
-       \renewcommand*{\listschemename}{Table des sch\`emes}}
-     \addto{\captionsfrenchb}{%
-       \renewcommand*{\schemename}{\scshape Sch\`eme}}
-     \addto{\captionsfrenchb}{%
-       \renewcommand*{\listschemename}{Table des sch\`emes}}
-%    \end{macrocode}
-% To make these changes, \pkg{babel} has to be instructed to reload the current
-% language.
-%    \begin{macrocode}
-     \expandafter\selectlanguage\expandafter{\languagename}
-%    \end{macrocode}
-% If \pkg{babel} was loaded after \currpkg, and the document is in
-% French, then the non-\pkg{memoir} patch for floats is needed here.
-% This is the same one described earlier, which cannot be delayed to
-% here if \pkg{babel} is loaded first.
-%    \begin{macrocode}
-     \@ifclassloaded{memoir}{}
-       {\IfLanguageName{french}
-          {\ifcsh@babel\else
-             \let\floatc@plain\FB@makecaption
-           \fi}
-          {\IfLanguageName{frenchb}
-            {\ifcsh@babel\else
-               \let\floatc@plain\FB@makecaption
-             \fi}
-          {}}}
-      {}}{}}
-%    \end{macrocode}
-%
-%\subsection{Reference numbers in graphics}
-%\begin{macro}{\schemerefmarker}
-%\changes{v1.3}{2007/10/04}{Name change}
-%\begin{macro}{\schemerefformat}
-%\changes{v1.3}{2007/10/04}{Name change}
-% The two macros \cs{schemerefmarker} and \cs{schemerefformat}
-% are used to allow customisation of the behaviour of the package.
-% Here defaults are provided.
-%    \begin{macrocode}
-\newcommand*{\schemerefmarker}{TMP}
-\newcommand*{\schemerefformat}{\textsf}
-%    \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\begin{macro}{\csh@label}
-% Depending on the user options provided, either \pkg{bpchem} or
-% \pkg{chemcompounds} is loaded to manage chemical citations.  The macro
-% \cs{chemsch@label} is defined as the labelling command of the
-% appropriate package.
-%    \begin{macrocode}
-\ifcsh@bpchem
-  \RequirePackage{bpchem}
-  \let\csh@label\CNlabel
-\else
-  \RequirePackage{chemcompounds}
-  \let\csh@label\compound
-\fi
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\csh@num}
-% A counter is needed for automatic substitution of reference
-% numbers.  This has to be a \TeX\ count, rather than a \LaTeX\
-% counter, as it has to be local.
-%    \begin{macrocode}
-\newcount\csh@num
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\schemeref}
-%\changes{v1.3}{2007/10/04}{New macro}
-% The user macro for referencing a compound in a graphic. First the
-% automatic counter is incremented.
-%    \begin{macrocode}
-\newcommand*{\schemeref}{%
-  \advance\csh@num\@ne
-%    \end{macrocode}
-% Now the presence of an optional argument is tested for.  If there
-% is not one, the value of the automatic counter is used.
-%    \begin{macrocode}
-  \@ifnextchar[%]
-    {\csh@schemeref}
-    {\csh@schemeref[\schemerefmarker\the\csh@num]}}
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\csh@schemeref}
-% The internal command to substitute the temporary marker by
-% the automatic label text.  The use of |[b][b]| ensures that
-% the new text is centred on the position of the marker.
-%    \begin{macrocode}
-\def\csh@schemeref[#1]#2{%
-  \psfrag{#1}[b][b]
-    {\schemerefformat{\csh@label{#2}}}}
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\csh@schemerefsub}
-% For sub-referencing using \pkg{bpchem}, a similar macro is needed
-% using the \cs{CNlabelsub} command.  This is defined here, with the
-% user macro later.
-%    \begin{macrocode}
-\def\csh@schemerefsub[#1]#2#3{%
-  \psfrag{#1}[b][b]
-    {\schemerefformat{\CNlabelsub{#2}{#3}}}}
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\chemschemeref}
-%\changes{v1.3}{2007/10/04}{Converted to a wrapper for
-%  \cs{schemeref}}
-% The \cs{chemschemeref} is now a backward-compatibility wrapper for
-% \cs{schemeref}.
-%    \begin{macrocode}
-\newcommand*{\chemschemeref}[1]{\schemeref[#1]}
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\schemerefsub}
-%\changes{v1.3}{2007/10/04}{New macro}
-%\begin{macro}{\chemschemerefsub}
-%\changes{v1.3}{2007/10/04}{Now a wrapper for \cs{schemerefsub}}
-% The user sub-referencing macro is defined in a package-dependent
-% manner.  If \pkg{bpchem} is loaded, then \cs{schemerefsub} works in
-% the same way as \cs{schemeref}, but calling the |sub| version of
-% the internal macro.
-%    \begin{macrocode}
-\ifcsh@bpchem
-  \newcommand*{\schemerefsub}{%
-    \advance\csh@num\@ne
-    \@ifnextchar[%]
-      {\csh@schemerefsub}
-      {\csh@schemerefsub[\schemerefmarker\the\csh@num]}}
-  \newcommand*{\chemschemerefsub}[1]{\schemerefsub[#1]}
-%    \end{macrocode}
-% If \pkg{chemcompounds} is in use, then the sub-reference commands
-% gobble the arguments given.  The automatic counter is still
-% incremented, so that things stay (reasonably) logical.
-%    \begin{macrocode}
-\else
-  \newcommand*{\schemerefsub}[3][]{%
-    \advance\csh@num\@ne
-    \PackageWarning{chemscheme}
-      {`chemcompound' option active\MessageBreak
-       Command \string\chemschemerefsub\space not used
-       \MessageBreak Please alter your source to \MessageBreak
-       \string\chemschemeref}}
-  \newcommand*{\chemschemerefsub}{\schemerefsub}
-\fi
-%    \end{macrocode}
-%\end{macro}
-%\end{macro}
-% \iffalse
-%</package>
-% \fi
-% \PrintChanges
-% \PrintIndex
-% \Finale
-%\iffalse
-%<*scheme>
-%!PS-Adobe-2.0 EPSF-1.2
-%%Creator: ChemDraw Std(tm) 10.0
-%<!labels>%%Title: scheme-one.eps
-%<labels>%%Title: scheme-two.eps
-%%CreationDate: 21/07/2007 12:00
-%%DocumentSuppliedProcSets: chemdict30 24 13
-%%DocumentFonts: Helvetica Helvetica-Oblique
-%%BoundingBox: 30 78 288 144
-%%EndComments
-%%BeginProcSet: chemdict30 24 13
-% ChemDraw Laser Prep
-% Copyright © 1985-2005 CambridgeSoft Corp., All Rights Reserved
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-  author =       {Michel Goossens and Frank Mittelbach and Sebastian Rahtz and Denis Roegel},
-  title =        {The LaTeX Graphics Companion},
-  subtitle =     {Illustrating Documents with TeX and Postscript},
-  publisher =    {Addison Wesley},
-  year =         {2007},
-  series =       {Tools and Techniques for Computer Typesetting},
-  edition =      {2},
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-- 
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