%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-2-46 on page 543.
%% 
%%  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[pictex]{m-ch-en}
\StopShownPreambleCommands
\begin{document}
\definechemical[sixring]
   {\chemical[SIX,B,R,RZ]}
\startchemical[size=small]
 \chemical[sixring]
\qquad\qquad\qquad\qquad\qquad
 \chemical[sixring]
   [R_1,R_2,R_3,R_4,R_5,R_6]
\stopchemical
\end{document}