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%%  Ein Beispiel der DANTE-Edition
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%%  2. Auflage
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%%  Beispiel 15-05-11 auf Seite 817.
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%%  Copyright (C) 2016 Herbert Voss
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%%  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.
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{145.16928pt}
\parindent=0pt
%StartShownPreambleCommands
\usepackage{chemfig}
%StopShownPreambleCommands
\begin{document}
  \chemfig{-[:30]-[:-30]-[:30](=[:90]O)-[:-30]OH}
\end{document}