\documentclass{ppex}

\documentclass{ppex}
\nonstopmode
\usepackage {m-chemic}
\pagestyle{empty}
\setlength\textwidth{207.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {m-chemic}
\startchemical[scale=small,size=medium]
\chemical[SIX,B1..6,R1..6]
\qquad\qquad\qquad
\chemical[SIX,B1..5,R12,RZ12][A]
\qquad\qquad\qquad\qquad
\chemical[SIX,B1..6,R1..6,RZ1..3]
[CH_3,CH_3,OH]
\stopchemical
\end{document}