\documentclass{ppex}
\nonstopmode
\AtBeginDocument {\setlength \unitlength {0.09pt}}
\usepackage {ccycle}
\pagestyle{empty}

\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {ccycle}
\bicychepv{2D==O}         \bicycheph[b]{2==OMe;3==OMe}
\bornane{3B==OH;2A==OH}   \adamantane{2D==O;6D==O;1==F;3==Cl}
\end{document}