[Tex/LaTex] How to draw styrene using xymtex

Question

How can I draw styrene using xymtex?

Answer 1

This is my first use of the package xymtex.

\documentclass{article}
\usepackage{xymtex}
\begin{document}
\sbox4{%
  \begin{picture}(0,0)(343,502)%
    \put(0,0){\bzdrh[c]{}}%
  \end{picture}%
}
\bzdrv[c]{1==CH=CH$_2$}
\ethylene{1==C;2==C}{1==H;2==H;3==\box4;4==H}
\end{document}