\documentclass{standalone}
\usepackage{helvet}
\usepackage{fontenc}
\usepackage{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{\ensuremath{\mathsf{#1} } }
\setatomsep{1.7em}
\setdoublesep{.6ex}
\setarrowdefault{,1,ultra thick}
\setbondstyle{thick,cap=round}
\definesubmol\nobond{-}
 
\pagestyle{empty}
\thispagestyle{empty}
\begin{document}
\begin{tikzpicture}
	\node {\chemfig{
		O=(-OH)
		-(<OH)-(-(-HO)=O)
		<-(-OH)=O
	} };
\end{tikzpicture}
\end{document}