% \iffalse meta-comment
%% File: hcycle.dtx
%
%  Copyright 1993,1996,1998 by Shinsaku Fujita
%
%  This file is part of XyMTeX system.
%  -------------------------------------
%
% This file is a successor to:
%
% hcycle.sty
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \typeout{XyMTeX for Drawing Chemical Structural Formulas. Version 1.00}
% \typeout{       -- Released December 1, 1993 by Shinsaku Fujita}
% Copyright (C) 1993 by Shinsaku Fujita, all rights reserved.
%
% 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{hcycle}
% \def\versi@ndate{December 01, 1993}
% \def\versi@nno{ver1.00}
% \def\copyrighth@lder{SF} % Shinsaku Fujita
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \def\j@urnalname{hcycle}
% \def\versi@ndate{August 16, 1996}
% \def\versi@nno{ver1.01}
% \def\copyrighth@lder{SF} % Shinsaku Fujita
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \def\j@urnalname{hcycle}
% \def\versi@ndate{October 31, 1998}
% \def\versi@nno{ver1.02}
% \def\copyrighth@lder{SF} % Shinsaku Fujita
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \fi
%
% \CheckSum{740}
%% \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{v1.01}{1996/06/26}{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{hcycle.dtx}[1996/12/25 v2.00 XyMTeX{} package file]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{hcycle.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{Further Hetrocycles by {\sffamily hcycle.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{hcycle.dtx}
\end{document}
%</driver>
% \fi
%
% \section{Introduction}\label{hcycle:intro}
%
% \subsection{Options for {\sffamily docstrip}}
%
% \DeleteShortVerb{\|}
% \begin{center}
% \begin{tabular}{|l|l|}
% \hline
% \emph{option} & \emph{function}\\ \hline
% hcycle & hcycle.sty \\
% driver & driver for this dtx file \\
% \hline
% \end{tabular}
% \end{center}
% \MakeShortVerb{\|}
%
% \subsection{Version Information}
%
%    \begin{macrocode}
%<*hcycle>
\typeout{XyMTeX for Drawing Chemical Structural Formulas. Version 2.00}
\typeout{       -- Released December 25, 1998 by Shinsaku Fujita}
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def\j@urnalname{hcycle}
\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 hcycle.sty}
%
% \begin{verbatim}
% ********************************
% * hcycle.sty: list of commands *
% ********************************
%
% <Convention for bond-setting>
%
%     \@pyrana
%     \@pyranb
%     \@pyranc
%
% <Pyranose and Furanose>
%
%     \pyranose                 \@pyranose
%     \furanose                 \@furanose
%
% <Adustment as substituents>
%
%     \ylpyranoseposition
%     \ylfuranoseposition
% \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 hcycle.sty} for the present case).  Hence, the combination 
% of |\input| and |\@ifundefined| is used to crossload sty 
% files ({\sf chemstr.sty} for the present case) in place of the 
% |\RequirePackage| command of \LaTeXe{}. 
%
%    \begin{macrocode}
% *************************
% * input of basic macros *
% *************************
\@ifundefined{setsixringv}{\input chemstr.sty\relax}{}
\unitlength=0.1pt
%    \end{macrocode}
%
% \section{Macros for setting substituents}
% 
% Macros |\@pyrana| to |\@pyranc| are used to set substituents 
% on each position of a pyranose and furanose. Note that 
% comments (conerning locant numbers) on the end of each row have 
% lost the exact meaning, 
% since such a command moiety is used in many macros after copying. 
%
% \begin{macro}{\@pyrana}
% \begin{macro}{\@pyranb}
% \begin{macro}{\@pyranbb}
% \begin{macro}{\@pyranbB}
% \begin{macro}{\@pyranc}
% \changes{v1.02}{1998/10/31}{Adding \cs{yl@xdiff} and \cs{yl@ydiff}}
%    \begin{macrocode}
% **************************************************
% * setting substituents for pyranose and furanose *
% **************************************************
% %%%%%%%%%%%%%%%
% % subst. on 1 %
% %%%%%%%%%%%%%%%
\def\@pyrana{%
   \if\@tmpb S%single bond
    \ifx\@tmpc\empty%
     \yl@xdiff=-10
     \yl@ydiff=30
           \put(0,0){\line(1,0){120}}% single bond at 1
           \putratom{130}{-30}{\@memberb}% right type
    \else\if\@tmpc a%(a) alpha
     \yl@xdiff=32
     \yl@ydiff=72
           \put(0,0){\line(0,-1){118}}% single bond at 1 alpha (down)
           \putratom{-32}{-190}{\@memberb}% right type
    \else\if\@tmpc b%(e) beta
     \yl@xdiff=32
     \yl@ydiff=-12
           \put(0,0){\line(0,1){118}}% single bond at 1 beta (up)
           \putratom{-32}{130}{\@memberb}% right type
    \else\if\@tmpc A% alpha
     \yl@xdiff=-10
     \yl@ydiff=60
           \put(0,0){\line(1,-1){120}}% single bond at 1
           \putratom{130}{-180}{\@memberb}% right type
    \else\if\@tmpc B% beta
     \yl@xdiff=-10
     \yl@ydiff=10
           \put(0,0){\line(1,1){120}}% single bond at 1
           \putratom{130}{110}{\@memberb}% right type
    \fi\fi\fi\fi\fi%
   \else \if\@tmpb D%double bond
     \yl@xdiff=-10
     \yl@ydiff=30
           \put(0,-15){\line(1,0){120}}% double bond at 1
           \put(0,15){\line(1,0){120}}% double bond at 1
           \putratom{130}{-30}{\@memberb}% right type
          \else%
     \yl@xdiff=-10
     \yl@ydiff=30
           \put(0,0){\line(1,0){120}}% single bond at 1
           \putratom{130}{-30}{\@memberb}% right type
   \fi\fi}%
%    \end{macrocode}
%
% \changes{v1.02}{1998/10/25}{\cs{@pyranb} is divided into 
% \cs{@pyranb}, \cs{@pyranbb} and \cs{@pyranbB}}
% \changes{v1.02}{1998/10/31}{Adding \cs{yl@xdiff} and \cs{yl@ydiff}}
%    \begin{macrocode}
% %%%%%%%%%%%%%%%%%%%
% % subst. on 2,3,5 %
% %%%%%%%%%%%%%%%%%%%
% %%%%%%%%%%%%%%%
% % subst. on 2 %
% %%%%%%%%%%%%%%%
\def\@pyranb{%
   \if\@tmpb S%single bond
    \ifx\@tmpc\empty%
     \yl@xdiff=-10
     \yl@ydiff=60
           \put(0,0){\line(1,-1){120}}% single bond at 1
           \putratom{130}{-180}{\@memberb}% left type
    \else\if\@tmpc a%(a) alpha
     \yl@xdiff=32
     \yl@ydiff=72
           \put(0,0){\line(0,-1){118}}% single bond alpha (down)
           \putlratom{-32}{-190}{\@memberb}% left & right type
    \else\if\@tmpc b%(b) beta
     \yl@xdiff=32
     \yl@ydiff=-12
           \put(0,0){\line(0,1){118}}% single bond beta (up)
           \putlratom{-32}{130}{\@memberb}% left & right type
    \fi\fi\fi%\fi\fi%
   \else \if\@tmpb D%double bond: Added by SF 1998/10/25
     \yl@xdiff=-10
     \yl@ydiff=60
           \put(-15,-15){\line(1,-1){120}}% double bond at 1
           \put(0,15){\line(1,-1){120}}% double bond at 1
           \putratom{130}{-180}{\@memberb}% right type
          \else%
     \yl@xdiff=-10
     \yl@ydiff=10
           \put(0,0){\line(1,1){120}}% single bond at 1
           \putratom{130}{110}{\@memberb}% left type
\fi\fi}%
%    \end{macrocode}
%
% \changes{v1.02}{1998/10/31}{Adding \cs{yl@xdiff} and \cs{yl@ydiff}}
%    \begin{macrocode}
% %%%%%%%%%%%%%%%
% % subst. on 3 %
% %%%%%%%%%%%%%%%
\def\@pyranbb{%
   \if\@tmpb S%single bond
    \ifx\@tmpc\empty%
     \yl@xdiff=-10
     \yl@ydiff=60
           \put(0,0){\line(1,-1){120}}% single bond at 1
           \putratom{130}{-180}{\@memberb}% left type
    \else\if\@tmpc a%(a) alpha
     \yl@xdiff=32
     \yl@ydiff=72
           \put(0,0){\line(0,-1){118}}% single bond alpha (down)
           \putlratom{-32}{-190}{\@memberb}% left & right type
    \else\if\@tmpc b%(b) beta
     \yl@xdiff=32
     \yl@ydiff=-12
           \put(0,0){\line(0,1){118}}% single bond beta (up)
           \putlratom{-32}{130}{\@memberb}% left & right type
    \fi\fi\fi%\fi\fi%
   \else \if\@tmpb D%double bond: Added by SF 1998/10/25
     \yl@xdiff=20
     \yl@ydiff=60
           \put(15,-15){\line(-1,-1){120}}% double bond at 1
           \put(0,15){\line(-1,-1){120}}% double bond at 1
           \putlatom{-130}{-180}{\@memberb}%left type
          \else%
     \yl@xdiff=10
     \yl@ydiff=60
           \put(0,0){\line(-1,-1){120}}% single bond at 1
           \putlatom{-130}{-180}{\@memberb}% left type
\fi\fi}%
%    \end{macrocode}
%
% \changes{v1.02}{1998/10/31}{Adding \cs{yl@xdiff} and \cs{yl@ydiff}}
%    \begin{macrocode}
% %%%%%%%%%%%%%%%
% % subst. on 5 %
% %%%%%%%%%%%%%%%
\def\@pyranbB{%
   \if\@tmpb S%single bond
    \ifx\@tmpc\empty%
     \yl@xdiff=-10
     \yl@ydiff=60
           \put(0,0){\line(1,-1){120}}% single bond at 5
           \putratom{130}{-180}{\@memberb}% left type
    \else\if\@tmpc a%(a) alpha
     \yl@xdiff=32
     \yl@ydiff=72
           \put(0,0){\line(0,-1){118}}% single bond alpha (down)
           \putlratom{-32}{-190}{\@memberb}% left & right type
    \else\if\@tmpc b%(b) beta
     \yl@xdiff=32
     \yl@ydiff=-12
           \put(0,0){\line(0,1){118}}% single bond beta (up)
           \putlratom{-32}{130}{\@memberb}% left & right type
    \fi\fi\fi%\fi\fi%
   \else \if\@tmpb D%double bond: Added by SF 1998/10/25
     \yl@xdiff=0
     \yl@ydiff=-20
           \put(15,15){\line(-1,1){120}}% double bond at 5
           \put(0,-15){\line(-1,1){120}}% double bond at 5
           \putlatom{-120}{140}{\@memberb}%left type
          \else%
     \yl@xdiff=10
     \yl@ydiff=-20
           \put(0,0){\line(-1,1){120}}% single bond at 1
           \putlatom{-130}{140}{\@memberb}% left type
\fi\fi}%
%    \end{macrocode}
%
% \changes{v1.02}{1998/10/31}{Adding \cs{yl@xdiff} and \cs{yl@ydiff}}
%    \begin{macrocode}
% %%%%%%%%%%%%%%%
% % subst. on 4 %
% %%%%%%%%%%%%%%%
\def\@pyranc{%
   \if\@tmpb S%single bond
    \ifx\@tmpc\empty%
     \yl@xdiff=10
     \yl@ydiff=30
           \put(0,0){\line(-1,0){120}}% single bond at 4
           \putlatom{-130}{-30}{\@memberb}% left type
    \else\if\@tmpc a%(a) alpha
     \yl@xdiff=-32
     \yl@ydiff=72
           \put(0,0){\line(0,-1){118}}% single bond at 4 alpha (down)
           \putlatom{32}{-190}{\@memberb}% left type
    \else\if\@tmpc b%(e) beta
     \yl@xdiff=-32
     \yl@ydiff=-12
           \put(0,0){\line(0,1){118}}% single bond at 4 beta (up)
           \putlatom{32}{130}{\@memberb}% left type
    \else\if\@tmpc A% alpha
     \yl@xdiff=10
     \yl@ydiff=60
           \put(0,0){\line(-1,-1){120}}% single bond at 4
           \putlatom{-130}{-180}{\@memberb}% left type
    \else\if\@tmpc B% beta
     \yl@xdiff=10
     \yl@ydiff=10
           \put(0,0){\line(-1,1){120}}% single bond at 4
           \putlatom{-130}{110}{\@memberb}% left type
    \fi\fi\fi\fi\fi%
   \else \if\@tmpb D%double bond
     \yl@xdiff=10
     \yl@ydiff=30
           \put(0,-15){\line(-1,0){120}}% double bond at 4
           \put(0,15){\line(-1,0){120}}% double bond at 4
           \putlatom{-130}{-30}{\@memberb}% left type
          \else%
     \yl@xdiff=10
     \yl@ydiff=30
           \put(0,0){\line(-1,0){120}}% single bond at 4
           \putlatom{-130}{-30}{\@memberb}% left type
   \fi\fi}%
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \section{Pyranose derivatives}
%
% The standard skeleton of pyranose is selected 
% to have the following locant numbers. 
%
% \begin{verbatim}
% ***********************
% * pyranose derivative *
% ***********************
%
% The following numbering is adopted in this macro. 
%
%                                5  e  6
%                                 ----O
%                             d *       * f
%   the original point ===> 4 *           * 1
%          (0,0)                *       * a
%                             c   -----
%                                3  b   2
% \end{verbatim}
%
% The macro |\pyranose| has an argument |SUBSLIST| as well as an optional 
% argument |BONDLIST|.  
% \begin{verbatim}
%
%   \pyranose[BONDLIST]{SUBSLIST}          
%
% \end{verbatim}
%
% The |BONDLIST| argument contains one or more 
% characters selected from a to f, each of which indicates the presence of 
% an inner (endcyclic) double bond on the corresponding position. 
% \begin{verbatim}
%
%     BONDLIST = 
%
%           none       :  mother skeleton
%           a          :  1,2-double bond
%           b          :  2,3-double bond
%           c          :  4,3-double bond
%           d          :  4,5-double bond
%           e          :  5,6-double bond
%           f          :  6,1-double bond
%
% \end{verbatim}
%
% The |SUBSLIST| argument contains one or more substitution descriptors 
% which are separated from each other by a semicolon.  Each substitution 
% descriptor has a locant number with a bond modifier and a substituent, 
% where these are separated with a double equality symbol. 
% \begin{verbatim}
%
%     SUBSLIST: list of substituents (max 5 substitution positions)
%
%       for n = 1 to 5 
%
%           nD         :  exocyclic double bond at n-atom
%           n or nS    :  exocyclic single bond at n-atom
%           nSA        :  single bond (down) at n-atom (for n=1)
%           nSB        :  single bond (up) at n-atom (for n=1)
%           nSa        :  alpha single bond at n-atom
%           nSb        :  beta single bond at n-atom
%
% \end{verbatim}
%
% Several examples are shown as follows.
% \begin{verbatim}
%       e.g. 
%        
%        \pyranose{1Sb==Cl;2Sa==F}
%        \pyranose{1Sb==Cl;4Sa==F;2Sa==CH$_{3}$}
%        \pyranose[a]{3Sb==OAc;4Sb==\lmoiety{MeO};5Sb==CH$_{2}$OAc}
% \end{verbatim}
%
% The definition of |\@pyranose| uses a picture environment, in which 
% bonds are put directly, while subsituents are typset by using 
% the macros |\@pyrana| to |\@pyranc| described above.  
% \changes{v1.02}{1998/10/31}{Adding \cs{ylpyranoseposition}, \cs{if@ylsw},
% \cs{yl@shifti}, \cs{@ylii}, \cs{yl@shiftii}, \cs{@ylii}, 
% \cs{yl@xdiff} and \cs{yl@ydiff}}
%
% \begin{macro}{\pyranose}
% \begin{macro}{\@pyranose}
%    \begin{macrocode}
\def\pyranose{\@ifnextchar[{\@pyranose}{\@pyranose[r]}}
\def\@pyranose[#1]#2{%
\@reset@ylsw%
\ylpyranoseposition{#2}%
\def\@@ylii{0}\def\@@yli{0}%
\if@ylsw
 \yl@shiftii=\@ylii
 \yl@shifti=\@yli
 \advance\yl@shiftii\@@ylii
 \advance\yl@shifti\@@yli
 \advance\yl@shiftii\yl@xdiff
 \advance\yl@shifti\yl@ydiff
 \begin{picture}(0,0)(-\yl@shiftii,-\yl@shifti)
 \reset@yl@xydiff%1999/1/6 by S. Fujita
\else
 \begin{picture}(880,800)(-240,-400)
  \iforigpt \put(-240,-400){\circle*{50}}%
           \put(0,0){\circle{50}}% 
   \typeout{command `pyranose' origin: (0,0) ---> (240,400)}
  \fi%
\fi
  \put(0,0){\line(3,5){120}}%           %bond 4-5
  \put(120,200){\line(1,0){252}}%       %bond 5-6
  \put(532,0){\line(-3,5){96}}%         %bond 1-6
 {\thicklines%
  \put(0,0){\line(3,-5){120}}%          %bond 4-3
  \put(412,-200){\line(3,5){120}}%      %bond 2-1
  \put(120,-200){\line(1,0){292}}}%     %bond 3-2
  \putratom{382}{160}{O}% left type
  %
\@tfor\member:=#1\do{%
\if\member r%no endcyclic double bonds
\else \if\member a%
  \put(400,-150){\line(3,5){90}}%       %double bond 2-1
\else \if\member b%
  \put(150,-160){\line(1,0){232}}%      %double bond 3-2
\else \if\member c%
  \put(50,-12){\line(3,-5){90}}%        %double bond 4-3
\else \if\member d%
  \put(50,12){\line(3,5){90}}%          %double bond 4-5
\else \if\member e%
  \put(150,160){\line(1,0){232}}%       %double bond 5-6
\else \if\member f%
  \put(482,12){\line(-3,5){70}}%        %double bond 1-6
\fi\fi\fi\fi\fi\fi\fi}%
%
\@forsemicol\member:=#2\do{%
\ifx\member\empty\else
\expandafter\@m@mb@r\member;\relax%
\expandafter\threech@r\@membera{}{}%
\ifx\@memberb\@yl\else
\ifcase\@tmpa%0 omit
 \or \put(532,0){\@pyrana}% subst. on 1
 \or \put(412,-200){\@pyranb}% subst. on 2
 \or \put(120,-200){\@pyranbb}% subst. on 3
 \or \put(0,0){\@pyranc}% subst. on 4
 \or \put(120,200){\@pyranbB}% subst. on 5
\fi %end of ifcase
\fi\fi%
}\end{picture}}%               %end of \pyranose macro
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% The command |\ylpyranoseposition| is to obtain the shift values 
% |\@ylii| and |\@yli| which are used for shifting the standard 
% point of a substituent. 
% \changes{v1.02}{1998/10/25}{New commands for setting substituents}
%
% \begin{macro}{\ylpyranoseposition}
%    \begin{macrocode}
\def\ylpyranoseposition#1{%
\@@ylswfalse%%%\@reset@ylsw
\@forsemicol\member:=#1\do{%
\if@@ylsw\else
\ifx\member\empty\else
\expandafter\@m@mb@r\member;\relax
\expandafter\threech@r\@membera{}{}\relax
\ifx\@memberb\@yl\relax\@@ylswtrue\else\@@ylswfalse\fi
\if@@ylsw
\ifcase\@tmpa%0 omit
 \or\gdef\@ylii{-532}\gdef\@yli{0}\global\@ylswtrue% subst. on 1
 \or\gdef\@ylii{-412}\gdef\@yli{200}\global\@ylswtrue% subst. on 2
 \or\gdef\@ylii{-120}\gdef\@yli{200}\global\@ylswtrue% subst. on 3
 \or\gdef\@ylii{0}\gdef\@yli{0}\global\@ylswtrue% subst. on 4
 \or\gdef\@ylii{-120}\gdef\@yli{-200}\global\@ylswtrue% subst. on 5
\fi%end of ifcase
\fi\fi\fi}}%
%    \end{macrocode}
% \end{macro}
%
% \section{Furanose derivatives}
%
% The standard skeleton of furanose is selected 
% to have the following locant numbers. 
%
% \begin{verbatim}
% ***********************
% * furanose derivative *
% ***********************
%
% The following numbering is adopted in this macro. 
%
%                                   5
%                                   O
%                             d  *     * e
%   the original point ===> 4 *           * 1
%          (0,0)                *       * a
%                             c   -----
%                                3  b   2
%
% \end{verbatim}
%
% The macro |\furanose| has an argument |SUBSLIST| as well as an optional 
% argument |BONDLIST|.  
% \begin{verbatim}
%   \furanose[BONDLIST]{SUBSLIST}          
% \end{verbatim}
%
% The |BONDLIST| argument contains one or more 
% characters selected from a to e, each of which indicates the presence of 
% an inner (endcyclic) double bond on the corresponding position. 
% \begin{verbatim}
%     BONDLIST = 
%
%           none       :  mother skeleton
%           a          :  1,2-double bond
%           b          :  2,3-double bond
%           c          :  4,3-double bond
%           d          :  4,5-double bond
%           e          :  5,6-double bond
% \end{verbatim}
%
% The |SUBSLIST| argument contains one or more substitution descriptors 
% which are separated from each other by a semicolon.  Each substitution 
% descriptor has a locant number with a bond modifier and a substituent, 
% where these are separated with a double equality symbol. 
% \begin{verbatim}
%     SUBSLIST: list of substituents (max 4 substitution positions)
%
%       for n = 1 to 4
%
%           nD         :  exocyclic double bond at n-atom
%           n or nS    :  exocyclic single bond at n-atom
%           nSA        :  single bond (down) at n-atom (for n=1)
%           nSB        :  single bond (up) at n-atom (for n=1)
%           nSa        :  alpha single bond at n-atom
%           nSb        :  beta single bond at n-atom
%\end{verbatim}
%
% Several examples are shown as follows.
% \begin{verbatim}
%       e.g. 
%        
%        \furanose{1Sa==Cl;2Sb==F}
%
% \end{verbatim}
%
% The definition of |\@furanose| uses a picture environment, in which 
% bonds are put directly, while subsituents are typset by using 
% the macros |\@pyrana| to |\@pyranc| described above.  
% \changes{v1.02}{1998/10/31}{Adding \cs{ylfuranoseposition}, \cs{if@ylsw},
% \cs{yl@shifti}, \cs{@ylii}, \cs{yl@shiftii}, \cs{@ylii}, 
% \cs{yl@xdiff} and \cs{yl@ydiff}}
%
% \begin{macro}{\furanose}
% \begin{macro}{\@furanose}
%    \begin{macrocode}
\def\furanose{\@ifnextchar[{\@furanose}{\@furanose[r]}}
\def\@furanose[#1]#2{%
\@reset@ylsw%
\ylfuranoseposition{#2}%
\def\@@ylii{0}\def\@@yli{0}%
\if@ylsw
 \yl@shiftii=\@ylii
 \yl@shifti=\@yli
 \advance\yl@shiftii\@@ylii
 \advance\yl@shifti\@@yli
 \advance\yl@shiftii\yl@xdiff
 \advance\yl@shifti\yl@ydiff
 \begin{picture}(0,0)(-\yl@shiftii,-\yl@shifti)
 \reset@yl@xydiff%1999/1/6 by S. Fujita
\else
 \begin{picture}(880,800)(-240,-400)
  \iforigpt \put(-240,-400){\circle*{50}}%
           \put(0,0){\circle{50}}% 
   \typeout{command `furanose' origin: (0,0) ---> (240,400)}
\fi
  \fi%
   \put(0,0){\line(5,3){236}}%          %bond 4-5
   \put(532,0){\line(-5,3){236}}%       %bond 1-5
 {\thicklines%
  \put(0,0){\line(3,-5){120}}%          %bond 4-3
  \put(412,-200){\line(3,5){120}}%      %bond 2-1
  \put(120,-200){\line(1,0){292}}}%     %bond 3-2
  \putratom{236}{130}{O}% left type
%
\@tfor\member:=#1\do{%
\if\member r%no endcyclic double bonds
\else \if\member a%
  \put(400,-150){\line(3,5){80}}%       %double bond 2-1
\else \if\member b%
  \put(150,-160){\line(1,0){232}}%      %double bond 3-2
\else \if\member c%
  \put(50,-12){\line(3,-5){80}}%        %double bond 4-3
\else \if\member d%
  \put(50,0){\line(5,3){180}}%          %double bond 4-5
\else \if\member e%
  \put(482,0){\line(-5,3){180}}%        %double bond 1-5
\fi\fi\fi\fi\fi\fi}%
%
\@forsemicol\member:=#2\do{%
\ifx\member\empty\else
\expandafter\@m@mb@r\member;\relax%
\expandafter\threech@r\@membera{}{}%
\ifx\@memberb\@yl\else
\ifcase\@tmpa%0 omit
 \or \put(532,0){\@pyrana}% subst. on 1
 \or \put(412,-200){\@pyranb}% subst. on 2
 \or \put(120,-200){\@pyranbb}% subst. on 3
 \or \put(0,0){\@pyranc}% subst. on 4
\fi%end of ifcase
\fi\fi%
}\end{picture}}%               %end of \furanose macro
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% The command |\ylfuranoseposition| is to obtain the shift values 
% |\@ylii| and |\@yli| which are used for shifting the standard 
% point of a substituent. 
% \changes{v1.02}{1998/10/23}{New commands for setting substituents}
%
% \begin{macro}{\ylfuranoseposition}
%    \begin{macrocode}
\def\ylfuranoseposition#1{%
\@@ylswfalse%%%\@reset@ylsw
\@forsemicol\member:=#1\do{%
\if@@ylsw\else
\ifx\member\empty\else
\expandafter\@m@mb@r\member;\relax
\expandafter\threech@r\@membera{}{}\relax
\ifx\@memberb\@yl\relax\@@ylswtrue\else\@@ylswfalse\fi
\if@@ylsw
\ifcase\@tmpa%0 omit
 \or\gdef\@ylii{-532}\gdef\@yli{0}\global\@ylswtrue% subst. on 1
 \or\gdef\@ylii{-412}\gdef\@yli{200}\global\@ylswtrue% subst. on 2
 \or\gdef\@ylii{-120}\gdef\@yli{200}\global\@ylswtrue% subst. on 3
 \or\gdef\@ylii{0}\gdef\@yli{0}\global\@ylswtrue% subst. on 4
\fi%end of ifcase
\fi\fi\fi}}%
%</hcycle>
%    \end{macrocode}
% \end{macro}
%
% \Finale
%
\endinput