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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 8-2-40 on page 540.
%%
%% Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%
\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.83385pt}
\StartShownPreambleCommands
\usepackage{xymtexps,chmst-ps}
\StopShownPreambleCommands
\begin{document}
\begin{chemeqn}
HO\sp{-}~+~
\raisebox{-28pt}{\ltetrahedralS{0==C;1==Cl;%
2==C$\sb{3}$H$\sb{7}$;%
3A==CH$\sb{3}$;4B==C$\sb{2}$H$\sb{5}$}}
\reactrarrow{0pt}{1cm}{}{}\qquad
\raisebox{-28pt}{\dtrigpyramid[{0{~~$\delta+$}}]%
{0==C;4A==HO$\sp{\delta-}$;%
5A==Cl$\sp{\delta-}$;%
1==C$\sb{3}$H$\sb{7}$;%
2A==CH$\sb{3}$;%
3B==C$\sb{2}$H$\sb{5}$}}
\quad\reactrarrow{0pt}{1cm}{}{}\quad
\raisebox{-28pt}{\rtetrahedralS{0==C;1==HO;%
2==C$\sb{3}$H$\sb{7}$;%
3A==CH$\sb{3}$;4B==C$\sb{2}$H$\sb{5}$}}
~+~Cl\sp{-} \label{myeqn}
\end{chemeqn}
\end{document}
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