\documentclass{ppex}
\nonstopmode
\AtBeginDocument {\setlength \unitlength {0.09pt}}
\usepackage {hetarom,epic}
\pagestyle{empty}
\setlength\textwidth{207.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {hetarom,epic}
\pyrazinev[l{1+}{4+}]
   {1==H;4==H;2==Cl;6==Cl}
\end{document}