\documentclass{ppex}
\nonstopmode
\AtBeginDocument {\setlength \unitlength {0.09pt}}
\usepackage {carom}
\pagestyle{empty}
\setlength\textwidth{207.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {carom}
\bzdrv[pa]{1D==O;4D==%
 \lmoiety{CH$_{3}$SO$_{2}$--N};%
 2==CH$_{3}$}
\bzdrv[pa]{1D==O;4D==%
 \rmoiety{N--SO$_{2}$CH$_{3}$};%
 2==CH$_{3}$}
\end{document}