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\documentclass{ppex} \nonstopmode \usepackage {m-chemic} \pagestyle{empty} \setlength\textwidth{207.0pt} \begin{document} \ResetPreambleCommands \ReadyForTheFray \usepackage {m-chemic} \startchemical \chemical[SIX,ROT2,B,R6,% SUB1,FIVE,B,R4] \stopchemical \end{document}