\documentclass{ppex}
\nonstopmode
\usepackage {m-chemic}
\pagestyle{empty}
\setlength\textwidth{207.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {m-chemic}
\definechemical[sixring]
 {\chemical[SIX,B,R,RZ135]%
           [R_1,R_3,R_5]}
\startchemical[size=small]
 \chemical[sixring,SIX,RZ246]
          [A,B,C]
\stopchemical
\end{document}

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