\documentclass{ppex}
\nonstopmode
\AtBeginDocument {\setlength \unitlength {0.09pt}}
\usepackage {hetarom,epic}
\pagestyle{empty}
\setlength\textwidth{207.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {hetarom,epic}
\sixheterov[eb]{1==N}
    {1D==O;
     4SA==MeO;4SB==OMe;
     5==Cl;
     6==Cl}
\threehetero[H]{2==C}
 {2Sa==COOH;2Sb==COOH}
\end{document}
