\documentclass{ppex}
\nonstopmode
\AtBeginDocument {\setlength \unitlength {0.09pt}}
\usepackage {aliphat}
\pagestyle{empty}
\setlength\textwidth{255.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {aliphat}
\rtrigonal{0==C;1D==O;2==Cl;3==F}
\qquad
\ltrigonal{0==C;1D==O;2==Cl;3==F}
\utrigonal{0==C;1D==O;2==Cl;3==F}
\Utrigonal{0==C;1D==O;2==Cl;3==F}
\dtrigonal{0==C;1D==O;2==Cl;3==F}
\qquad
\Dtrigonal{0==C;1D==O;2==Cl;3==F}
\end{document}
