File:Isocitric acid.svg

\documentclass[12pt,border=10pt,tikz,class=scrartcl,multi=false]{standalone}
\usepackage{helvet}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{mathtools,amssymb}
\usepackage{pgfplots}
\pgfplotsset{compat=1.12}
\usetikzlibrary{positioning,calc,arrows,fit,backgrounds,decorations.text,shapes}
 
\usepackage{chemfig,chemmacros}
\renewcommand*{\familydefault}{\sfdefault}
\renewcommand*\printatom[1]{\ensuremath{\mathsf{#1} } }
\setatomsep{1.7em}
\setdoublesep{.6ex}
\setarrowdefault{,1,ultra thick}
\setbondstyle{thick,cap=round}
\definesubmol\nobond{-[,0.2,,,draw=none]}
 
\pagestyle{empty}
\thispagestyle{empty}
\begin{document}
\begin{tikzpicture}
	\node {\chemfig{
		O=(-[::-60]OH)
		-[::60](<[::-60]OH)-[::60](-[::60](-[::60]HO)=[::-60]O)
		<[::-60]-[::60](-[::-60]OH)=[::60]O
	} };
\end{tikzpicture}
\end{document}