%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-2-38 on page 539.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It 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.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.83385pt}

\StartShownPreambleCommands
\usepackage{xymtexps}
\StopShownPreambleCommands
\begin{document}
\changeunitlength{0.09pt}
\wedgehashedwedge
\fourhetero[%
{b\fivefusevi{1==S;4==\null}%
{2Sa==CH$\sb{3}$;2Sb==CH$\sb{3}$;%
3A==COOH}{d}}]%
{2==N}{1D==O;3FA==H;4GA==H;4Su==%
\lyl(4==OCH$\sb{2}$CONH)%
{4==\bzdrh{4==(yl)}}}
\end{document}