%%
%% Ein Beispiel der DANTE-Edition
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%% 2. Auflage
%%
%% Beispiel 15-05-12 auf Seite 818.
%%
%% Copyright (C) 2016 Herbert Voss
%%
%% 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.
%%
%%
%% ====
% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\parindent=0pt
%StartShownPreambleCommands
\usepackage[greek=textalpha]{chemmacros}
\usepackage{chemfig}
%StopShownPreambleCommands
\begin{document}
\schemestart
\chemfig{*6(=-(-)=O)}
\arrow{->[\+\ch{H+}]}
\chemleft[
\subscheme[90]{%
\chemfig{*6((-[2,0.33,,,draw=none]\fscrp)-=(-)-OH)}
\arrow{<->}
\chemfig{*6(=-(-)(-[6,0.4,,,draw=none]\fscrp)-OH)}}
\chemright]
\arrow(@c3--)\chemfig{*6((-[2]R)-=(-)-OH)}\arrow(@c4--)\chemfig{*6(=-(-)(-[6]R)-OH)}
\schemestop
\end{document}
