%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-2-39 on page 540.
%% 
%%  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{135.83385pt}

\StartShownPreambleCommands
\usepackage{xymtexps}
\StopShownPreambleCommands
\begin{document}
\changeunitlength{0.09pt}
\tetrahedral{0==C;1A==CHO;%
             2B==H;4B==OH;3A==%
 \tetrahedral{0==C;1==(yl);%
              2B==HO;4B==H;3A==%
  \tetrahedral{0==C;1==(yl);%
               2B==H;4B==OH;3A==%
   \tetrahedral{0==C;1==(yl);%
                2B==H;4B==OH;3A==CH$\sb{2}$OH}}}}
\end{document}