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+% \iffalse meta-comment
+%% File: polymers.dtx
+%
+%  Copyright 1996, 1998 by Shinsaku Fujita
+%
+%  This file is part of XyMTeX system.
+%  -------------------------------------
+%
+% This file is a part of the macro package ``XyMTeX'' which has been 
+% designed for typesetting chemical structural formulas.
+%
+% This file is to be contained in the ``xymtex'' directory which is 
+% an input directory for TeX. It is a LaTeX optional style file and 
+% should be used only within LaTeX, because several macros of the file 
+% are based on LaTeX commands. 
+%
+% For the review of XyMTeX, see
+%  (1)  Shinsaku Fujita, ``Typesetting structural formulas with the text
+%    formatter TeX/LaTeX'', Computers and Chemistry, in press.    
+% The following book deals with an application of TeX/LaTeX to 
+% preparation of manuscripts of chemical fields:
+%  (2)  Shinsaku Fujita, ``LaTeX for Chemists and Biochemists'' 
+%    Tokyo Kagaku Dozin, Tokyo (1993) [in Japanese].  
+%
+% Copying of this file is authorized only if either
+%  (1) you make absolutely no changes to your copy, including name and 
+%     directory name; or
+%  (2) if you do make changes, 
+%     (a) you name it something other than the names included in the 
+%         ``xymtex'' directory and 
+%     (b) you are requested to leave this notice intact.
+% This restriction ensures that all standard styles are identical.
+%
+% Please report any bugs, comments, suggestions, etc. to:
+%   Shinsaku Fujita, 
+%   Ashigara Research Laboratories, Fuji Photo Film Co., Ltd., 
+%   Minami-Ashigara, Kanagawa-ken, 250-01, Japan.
+%
+% New address:
+%   Shinsaku Fujita, 
+%   Department of Chemistry and Materials Technology, 
+%   Kyoto Institute of Technology, \\
+%   Matsugasaki, Sakyoku, Kyoto, 606 Japan
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% \def\j@urnalname{polymers}
+% \def\versi@ndate{August 16, 1996}
+% \def\versi@nno{ver1.00}
+% \def\copyrighth@lder{SF} % Shinsaku Fujita
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% \def\j@urnalname{polymers}
+% \def\versi@ndate{October 31, 1998}
+% \def\versi@nno{ver1.02}
+% \def\copyrighth@lder{SF} % Shinsaku Fujita
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% \fi
+%
+% \CheckSum{503}
+%% \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         \~}
+%
+% \setcounter{StandardModuleDepth}{1}
+%
+% \StopEventually{}
+% \MakeShortVerb{\|}
+%
+% \iffalse
+% \changes{v1.00}{1996/07/07}{first edition for LaTeX2e}
+% \changes{v1.02}{1998/10/31}{revised edition for LaTeX2e}
+% \changes{v2.00}{1998/12/25}{enhanced edition for LaTeX2e}
+% \fi
+%
+% \iffalse
+%<*driver>
+\NeedsTeXFormat{pLaTeX2e}
+% \fi
+\ProvidesFile{polymers.dtx}[1998/12/25 v2.00 XyMTeX{} package file]
+% \iffalse
+\documentclass{ltxdoc}
+\GetFileInfo{polymers.dtx}
+%
+% %%XyMTeX Logo: Definition 2%%%
+\def\UPSILON{\char'7}
+\def\XyM{X\kern-.30em\smash{%
+\raise.50ex\hbox{\UPSILON}}\kern-.30em{M}}
+\def\XyMTeX{\XyM\kern-.1em\TeX}
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\title{Polymers by {\sffamily polymers.sty} 
+(\fileversion) of \XyMTeX{}}
+\author{Shinsaku Fujita \\ 
+Department of Chemistry and Materials Technology, \\
+Kyoto Institute of Technology, \\
+Matsugasaki, Sakyoku, Kyoto, 606 Japan
+% % (old address)
+% % Ashigara Research Laboratories, 
+% % Fuji Photo Film Co., Ltd., \\ 
+% % Minami-Ashigara, Kanagawa, 250-01 Japan
+}
+\date{\filedate}
+%
+\begin{document}
+   \maketitle
+   \DocInput{polymers.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% \section{Introduction}\label{polymers:intro}
+%
+% \subsection{Options for {\sffamily docstrip}}
+%
+% \DeleteShortVerb{\|}
+% \begin{center}
+% \begin{tabular}{|l|l|}
+% \hline
+% \emph{option} & \emph{function}\\ \hline
+% polymers & polymers.sty \\
+% driver & driver for this dtx file \\
+% \hline
+% \end{tabular}
+% \end{center}
+% \MakeShortVerb{\|}
+%
+% \subsection{Version Information}
+%
+%    \begin{macrocode}
+%<*polymers>
+\typeout{XyMTeX for Drawing Chemical Structural Formulas. Version 2.00}
+\typeout{       -- Released December 25, 1998 by Shinsaku Fujita}
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\def\j@urnalname{polymers}
+\def\versi@ndate{December 25, 1998}
+\def\versi@nno{ver2.00}
+\def\copyrighth@lder{SF} % Shinsaku Fujita
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\typeout{XyMTeX Macro File `\j@urnalname' (\versi@nno) <\versi@ndate>%
+\space[\copyrighth@lder]}
+%    \end{macrocode}
+%
+% \section{List of commands for polymers.sty}
+%
+% \begin{verbatim}
+% **********************************
+% * polymers.sty: list of commands * 
+% **********************************
+%
+%  <Delimeters for polymer units>
+%
+%    \leftPMdelim      \rightPMdelim 
+%    \leftpmdelim      \rightpmdelim
+%
+%   \leftPolymer       \leftpolymer
+%   \rightPolymer      \rightpolymer
+%
+%   \leftsqrPolymer    \leftSqrpolymer
+%   \lsqrdelimiter     \leftsqrpolymer
+%
+%   \rightsqrPolymer   \rightSqrpolymer
+%   \rsqrdelimiter     \rightsqrpolymer
+%
+%   \@sqrpolymer
+%   \sqrpolymer        \Sqrpolymer
+%   \mpolymer
+%
+%  <Bonds for polymers>
+%
+%   \WestPbond         \EastPbond
+%   \sbond
+%
+%  <Polymers>
+%
+%   \polyethylene      \@polyethylene
+%   \polystyrene       \@polystyrene
+%
+% \end{verbatim}
+%
+% \section{Input of basic macros}
+%
+% To assure the compatibility to \LaTeX{}2.09 (the native mode), 
+% the commands added by \LaTeXe{} have not been used in the resulting sty 
+% files ({\sf polymers.sty} for the present case).  Hence, the combination 
+% of |\input| and |\@ifundefined| is used to crossload sty 
+% files ({\sf chemstr.sty} etc. for the present case) in place of the 
+% |\RequirePackage| command of \LaTeXe{}. 
+%
+%    \begin{macrocode}
+% *************************
+% * input of basic macros *
+% *************************
+\@ifundefined{setsixringv}{\input chemstr.sty\relax}{}
+\@ifundefined{Westbond}{\input aliphat.sty\relax}{}
+\@ifundefined{bzdrv}{\input carom.sty\relax}{}
+\unitlength=0.1pt
+%    \end{macrocode}
+%
+%    \begin{macrocode}
+% ****************************************************
+% * For separating an augument list to each argument *
+% ****************************************************
+%
+\def\@forsemicol#1:=#2\do#3{%
+%% \edef\@fortmp{#2}\ifx\@fortmp\@empty%
+  \expandafter\def\expandafter\@fortmp\expandafter{#2}%
+  \ifx\@fortmp\@empty%
+    \else%
+    \expandafter\@forl@@p#2;\@nil;\@nil\@@#1{#3}\fi}
+%    \end{macrocode}
+%
+% \section{Delimeters for polymer units}
+%
+% \subsection{Right and left delimeters}
+%
+% A polymer structure has a unit surrounded by 
+% parentheses or other delimeters. For drawing a 
+% parenthesis as the part of a substituent, 
+% the following commands are prepared. 
+% 
+% \subsubsection{Parentheses}
+%
+% \begin{macro}{\leftPMdelim}
+% \begin{macro}{\leftpmdelim}
+%    \begin{macrocode}
+% ********************************
+% * Delimeters for polymer units *
+% ********************************
+\def\leftPMdelim#1{$\mathstrut #1$}
+\def\leftpmdelim{\leftPMdelim{\biggm(}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\rightPMdelim}
+% \begin{macro}{\rightpmdelim}
+%    \begin{macrocode}
+\def\rightPMdelim#1#2{%
+ $\mathstrut #1_{\mkern-5mu #2}$}
+\def\rightpmdelim#1{\rightPMdelim{\biggm)}{#1}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% The command |\leftpolymer| typesets the left parenthesis of 
+% a polymer unit. 
+% The command |\leftPolymer| is the inner commend of |\leftpolymer|, 
+% where a delimeter can be selected as an argument. 
+%
+% \begin{macro}{\leftPolymer}
+% \begin{macro}{\leftpolymer}
+%    \begin{macrocode}
+\def\leftPolymer#1#2{%
+\begin{picture}(0,0)(0,0)
+\putlatom{0}{0}{#2}
+\putlatom{120}{0}{$#1$}
+\end{picture}}
+\def\leftpolymer#1{\leftPolymer{\biggm(}{#1}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% The command |\rightpolymer| typesets the left parenthesis of 
+% a polymer unit along with a repeating number as a subscript. 
+% The command |\rightPolymer| is the inner commend of |\rightpolymer|, 
+% where a delimeter can be selected as an argument. 
+%
+% \begin{macro}{\Rightpolymer}
+% \begin{macro}{\rightpolymer}
+%    \begin{macrocode}
+\def\rightPolymer#1#2#3{%
+\begin{picture}(0,0)(0,0)
+\putratom{0}{0}{#2}
+\putratom{-150}{0}{%
+% $\mathstrut#1_{\mkern-3mu \mbox{\scriptsize\rm #3}}$}
+ $\mathstrut#1_{\mkern-2mu #3}$}
+\end{picture}}
+\def\rightpolymer#1#2{\rightPolymer{\biggm)}{#1}{#2}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \subsubsection{Brackets}
+%
+% The command |\leftSqrpolymer| typesets the left bracket of 
+% a polymer unit. 
+% The command |\leftsqrPolymer| is the inner commend of |\leftSqrpolymer|, 
+% where a delimeter can be selected as an argument. 
+% The bracket selected by the command |\leftSqrpolymer| is 
+% a \TeX{} big mathematical symbol, 
+% the line of which is 
+% boldfaced. 
+%
+% \begin{macro}{\leftsqrPolymer}
+% \begin{macro}{\leftSqrpolymer}
+%    \begin{macrocode}
+\def\leftsqrPolymer#1#2{%
+\begin{picture}(0,0)(0,0)
+\putlatom{0}{0}{#2}
+\putlatom{120}{0}{$#1$}
+\end{picture}}
+\def\leftSqrpolymer#1{\leftsqrPolymer{\Biggm[}{#1}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% The command |\rightSqrpolymer| typesets the right bracket of 
+% a polymer unit. 
+% The command |\rightsqrPolymer| is the inner commend of |\rightSqrpolymer|, 
+% where a delimeter can be selected as an argument. 
+% The bracket selected by the command |\rightSqrpolymer| is 
+% a \TeX{} big mathematical symbol, 
+% the line of which is boldfaced. 
+%
+% \begin{macro}{\rightsqrPolymer}
+% \begin{macro}{\rightSqrpolymer}
+%    \begin{macrocode}
+\def\rightsqrPolymer#1#2#3{%
+\begin{picture}(0,0)(0,0)
+\putratom{0}{0}{#2}
+\putratom{-150}{0}{%
+% $\mathstrut #1_{\mbox{\scriptsize\rm #3}}$}
+ $\mathstrut #1_{#3}$}
+\end{picture}}
+\def\rightSqrpolymer#1#2{\rightsqrPolymer{\Biggm]}{#1}{#2}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% For drawing polymer brackets of thin line width, 
+% we prepare the command |\lsqrdelimiter|.  The height of 
+% the bracket can be designated by the argument of this 
+% command.  The command 
+% is used to define the command |\leftsqrpolymer|. 
+% This command typesets a left bracket of thin line width. 
+%
+% \begin{macro}{\lsqrdelimiter}
+% \begin{macro}{\leftsqrpolymer}
+%    \begin{macrocode}
+\def\lsqrdelimiter#1{%
+\hbox{\vrule \@width\fboxrule
+$\vcenter to#1{%
+\hrule \@height\fboxrule \@width\fboxsep
+\vfill
+\hrule \@height\fboxrule \@width\fboxsep}$}}
+\def\leftsqrpolymer#1{%
+ \leftsqrPolymer{\lsqrdelimiter{300\unitlength}}{#1}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% The command |\rsqrdelimiter| is 
+% used to define the command |\rightsqrpolymer|, which 
+% typesets a right bracket of thin line width. 
+%
+% \begin{macro}{\rsqrdelimiter}
+% \begin{macro}{\rightsqrpolymer}
+%    \begin{macrocode}
+\def\rsqrdelimiter#1{%
+\hbox{$\vcenter to#1{%
+\hrule \@height\fboxrule \@width\fboxsep \vfill
+\hrule \@height\fboxrule \@width\fboxsep}$\kern-\fboxrule
+\vrule \@width\fboxrule\kern2pt}}
+\def\rightsqrpolymer#1#2{%
+\rightsqrPolymer{\rsqrdelimiter{300\unitlength}}{#1}{#2}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \subsection{Pairs of delimeters}
+%
+% The command |\sqrpolymer| typesets a pair of thin-line brackets that 
+% surrounds a polymer unit after measuring the height of 
+% the unit. On the other hand, 
+% the command |\Sqrpolymer| typesets a pair of thick-line brackets. 
+% Both of the commands are based on the inner macro |\@sqrpolymer|, 
+% in which a line width is designated by means of an argument. 
+%
+% \begin{macro}{\@sqrpolymer}
+% \begin{macro}{\sqrpolymer}
+% \begin{macro}{\Sqrpolymer}
+%    \begin{macrocode}
+\long\def\@sqrpolymer#1#2#3{%
+\begingroup \fboxrule=#1
+ \leavevmode\setbox\@tempboxa\hbox{#2}\@tempdima\fboxrule
+    \advance\@tempdima \fboxsep \advance\@tempdima \dp\@tempboxa
+ \@tempdimb=\wd\@tempboxa
+ \advance\@tempdimb by \fboxsep
+ \advance\@tempdimb by \fboxsep
+ \advance\@tempdimb by \fboxrule
+ \advance\@tempdimb by \fboxrule
+   \hbox{\lower \@tempdima\hbox
+  {\vbox{
+  \hbox to\@tempdimb{%
+  \vrule \@height \fboxrule \@width\fboxsep\hfill
+  \vrule \@height \fboxrule \@width\fboxsep}
+  \nointerlineskip
+          \hbox{\vrule \@width \fboxrule \hskip\fboxsep
+          \vbox{\vskip\fboxsep \copy\@tempboxa\vskip\fboxsep}\hskip 
+                 \fboxsep\vrule \@width \fboxrule}
+  \nointerlineskip
+  \hbox to\@tempdimb{%
+  \vrule \@height \fboxrule \@width\fboxsep\hfill
+  \vrule \@height \fboxrule \@width\fboxsep}}}}%
+\kern2pt\lower\@tempdima\hbox{\scriptsize$#3$}\endgroup}
+\long\def\sqrpolymer#1#2{\@sqrpolymer{0.4pt}{#1}{#2}}
+\long\def\Sqrpolymer#1#2{\@sqrpolymer{1pt}{#1}{#2}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% The command |\mpolymer| typesets a pair of parentheses that 
+% surrounds a polymer unit after measuring the height of 
+% the unit. 
+%
+% \begin{macro}{\mpolymer}
+%    \begin{macrocode}
+\long\def\mpolymer#1#2{%
+ \leavevmode\setbox\@tempboxa\hbox{#1}\@tempdima\fboxrule
+  \advance\@tempdima \fboxsep \advance\@tempdima \dp\@tempboxa
+  \hbox{\lower \@tempdima\hbox{\vbox{\hbox{\hskip\fboxsep%
+  $\left(\vcenter{\vskip\fboxsep \copy\@tempboxa\vskip\fboxsep}%
+  \right)_{#2}$}}}}}
+%    \end{macrocode}
+% \end{macro}
+%
+% \section{Commands for drawing polymers}
+%
+% \subsection{Bonds for polymers}
+% 
+% The original commands 
+% |\Westbond| and |\Eastbond| are changed into 
+% |\WestPbond| and |\EastPbond|, where each bond is lengthened 
+% for making a space for drawing delimiters.  
+%
+% \begin{macro}{\WestPbond}
+% \begin{macro}{\EastPbond}
+% \begin{macro}{\sbond}
+%    \begin{macrocode}
+% **********************
+% * Bonds for polymers *
+% **********************
+\def\WestPbond{%
+\begin{picture}(100,100)(0,0)
+\put(-100,0){\Westbond}
+\put(-60,0){\line(-1,0){90}}
+\end{picture}}
+\def\EastPbond{%
+\begin{picture}(100,100)(0,0)
+\put(100,0){\Eastbond}
+\put(60,0){\line(1,0){90}}
+\end{picture}}
+\def\sbond{%
+\begin{picture}(160,0)(0,0)
+\put(0,33){\line(1,0){160}}
+\end{picture}}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \subsection{Polyethylene unit}
+%
+% The command |\polyethylene| is used to draw polyethylene derivatives, 
+% in which each substituent is designated by the |SUBSLIST|. 
+% The following numbering is used in this macro. 
+%
+% \begin{verbatim}
+% ********************
+% * polyethylene unit*
+% ********************
+%
+% The following numbering is adopted in this macro. 
+%
+%            |   1      6   |
+%            |              |
+%            |   |      |   |
+%        2 ---- (1) -- (2) ---- 5
+%            |   |  (0) |   |
+%            |              |
+%            |   3      4   |0
+% \end{verbatim}
+%
+% The command |\polyethylene| has arguments, 
+% |CALIST| and |SUBSLIST|, as well as an optional argument |AUXLIST|. 
+% \begin{verbatim}
+%   \polyethylene[AUXLIST]{CALIST}{SUBSLIST}
+% \end{verbatim}
+%
+% The optional argument |AUXLIST| is used for 
+% typesetting auxiliary symbols on central atoms. 
+% \begin{verbatim}
+%     AUXLIST = 
+%
+%       {n+}  :  + charge (or another one chararacter) on the center
+% \end{verbatim}
+%
+% The argument |CALIST| is used for indicating center atoms. 
+% \begin{verbatim}
+%     CALIST:  central atom list
+%
+%       for 1  :  cetral atom (e.g. 1==C)
+%           2  :  cetral atom (e.g. 2==C)
+%           0  :  cetral bond (e.g. 0D==)
+% \end{verbatim}
+%
+% The argument |SUBSLIST| is used for indicating  substituents. 
+% \begin{verbatim}
+%     SUBSLIST: list of substituents
+%
+%       for n = 1 to 4 
+%
+%           nT         :  triple bond at n-atom 
+%           nD         :  double bond at n-atom 
+%           n or nS    :  single bond at n-atom
+%           nA         :  alpha single bond at n-atom
+%           nB         :  beta single bond at n-atom
+% \end{verbatim}
+%
+% \begin{macro}{\if@centbondsw}
+% \begin{macro}{\if@centatswi}
+% \begin{macro}{\if@centatswii}
+%    \begin{macrocode}
+\newif\if@centbondsw \@centbondswfalse
+\newif\if@centatswi \@centatswifalse
+\newif\if@centatswii \@centatswiifalse
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\polyethylene}
+% \begin{macro}{\@polyethylene}
+%    \begin{macrocode}
+\def\polyethylene{\@ifnextchar[{\@polyethylene}{\@polyethylene[]}}
+\def\@polyethylene[#1]#2#3{%
+ \begin{picture}(1100,600)(-400,-300)%
+  \iforigpt \put(-400,-300){\circle*{50}}%
+           \put(-\noshift,-\noshift){\circle{50}}% 
+   \typeout{command `polyethylene' origin: %
+    (\the\noshift,\the\noshift) ---> (400,300)}\fi%
+%    \end{macrocode}
+%
+%    \begin{macrocode}
+% ************
+% * aux list *
+% ************
+\def\@@@temp{#1}
+\ifx\@@@temp\empty\else
+\@tfor\member:=#1\do{%
+   \expandafter\twoch@@r\member{}{}%
+   \ifcase\@@tmpa
+    \or \relax \putratom{47}{50}{\scriptsize\@@tmpb}%
+    \or \relax \putratom{347}{50}{\scriptsize\@@tmpb}%
+\fi}\fi
+%    \end{macrocode}
+%
+%    \begin{macrocode}
+% *****************
+% * central atoms *
+% *****************
+\@forsemicol\member:=#2\do{%
+\ifx\member\empty\else
+\expandafter\@m@mb@r\member;\relax%
+   \expandafter\threech@r\@membera{}{}%
+   \ifcase\@tmpa \global\@centbondswtrue \put(20,0){\Eastbond}%
+   \or \global\@centatswitrue \putlratom{-40}{-33}{\@memberb}%
+   \or \global\@centatswiitrue \putlratom{260}{-33}{\@memberb}%
+\fi\fi}%
+\if@centatswi \else \putlratom{-40}{-33}{C}\fi
+\if@centatswii \else \putlratom{260}{-33}{C}\fi
+\if@centbondsw \else \put(70,0){\line(1,0){160}}\fi
+\global\@centbondswfalse
+\global\@centatswifalse
+\global\@centatswiifalse
+%    \end{macrocode}
+%
+%    \begin{macrocode}
+% ****************
+% * Substituents *
+% ****************
+\gdef\numrepeated{x}
+\@forsemicol\member:=#3\do{%
+\ifx\member\empty\else
+\expandafter\@m@mb@r\member;\relax%
+\expandafter\threech@r\@membera{}{}%
+\ifcase\@tmpa \gdef\numrepeated{\@memberb}%
+\or\put(0,0){\Northbond}%
+\or\put(0,0){\WestPbond}%
+\or\put(0,0){\Southbond}%
+\or\put(300,0){\Southbond}%
+\or\put(300,0){\EastPbond}%
+\or\put(300,0){\Northbond}%
+\fi\fi}%end of ifcase
+%    \end{macrocode}
+%
+%    \begin{macrocode}
+% **************
+% * Delimeters *
+% **************
+\put(-200,-33){\leftpmdelim}
+\put(400,-33){\rightpmdelim{\numrepeated}}
+\end{picture}}%end of macro polyethylene
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \subsection{Polyestyrene unit}
+%
+% The command |\polyestrene| is used to draw polystyrene derivatives, 
+% in which substituents on both the polymer chain and the phenyl group 
+% are designated by the |SUBSLIST| and |PHSUBSLIST|, respectively. 
+% The following numbering is adopted in this macro. 
+% \begin{verbatim}
+% ********************
+% * polystyrene unit *
+% ********************
+%
+%            |   1      6   |
+%            |              |
+%            |   |      |   |
+%        2 ---- (1) -- (2) ---- 5
+%            |   |  (0) |   |
+%            |          |   |
+%            |   3      |   |0
+%                      / `
+%                   6 |    | 2
+%                     |    |
+%                   5 `   / 3
+%                       `
+%                        4
+% \end{verbatim}
+%
+% The command |\polyethylene| has arguments, 
+% |CALIST|, |SUBSLIST| and |PHSUBSLIST|, 
+% as well as an optional argument |AUXLIST|. 
+% \begin{verbatim}
+%   \polystyrene[AUXLIST]{CALIST}{SUBSLIST}{PHSUBSLIST}
+% \end{verbatim}
+%
+% The optional argument |AUXLIST| is used for 
+% typesetting auxiliary symbols on central atoms. 
+% \begin{verbatim}
+%     AUXLIST = 
+%
+%       {n+}  :  + charge (or another one chararacter) on the center
+% \end{verbatim}
+%
+% The argument |CALIST| is used for indicating center atoms. 
+% \begin{verbatim}
+%     CALIST:  central atom list
+%
+%       for 1  :  cetral atom (e.g. 1==C)
+%           2  :  cetral atom (e.g. 2==C)
+%           0  :  cetral bond (e.g. 0D==)
+% \end{verbatim}
+%
+% The argument |SUBSLIST| is used for indicating  substituents on 
+% the polymer chain. 
+% \begin{verbatim}
+%     SUBSLIST: list of substituents
+%
+%       for n = 1 to 4 
+%
+%           nT         :  triple bond at n-atom 
+%           nD         :  double bond at n-atom 
+%           n or nS    :  single bond at n-atom
+%           nA         :  alpha single bond at n-atom
+%           nB         :  beta single bond at n-atom
+% \end{verbatim}
+%
+% The argument |PHSUBSLIST| is used for indicating  substituents on 
+% the phenyl group. 
+% \begin{verbatim}
+%     PHSUBSLIST: list of phenyl substituents
+%
+%       for n = 2 to 6
+%
+%           n or nS    :  single bond at n-atom
+% \end{verbatim}
+%
+% \begin{macro}{\polyethylene}
+% \begin{macro}{\@polyethylene}
+%    \begin{macrocode}
+\def\polystyrene{\@ifnextchar[{\@polystyrene}{\@polystyrene[]}}
+\def\@polystyrene[#1]#2#3#4{%
+\begin{picture}(1100,1200)(0,-640)%
+  \iforigpt \put(0,-640){\circle*{50}}%
+           \put(-\noshift,-\noshift){\circle{50}}% 
+   \typeout{command `polystyrene' origin: %
+    (\the\noshift,\the\noshift) ---> (0,640)}\fi%
+\begingroup \origptfalse
+\put(0,0){\polyethylene[#1]{#2}{#3}}%
+\put(700,0){\line(0,1){240}}%
+\put(300,-646){\bzdrv{#4}}%
+\endgroup
+\end{picture}}%end of macro polystyrene
+%</polymers>
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \Finale
+%
+\endinput
+
\ No newline at end of file