\documentclass{standalone}
\usepackage{chemfig}
\renewcommand*\printatom[1]{\ensuremath{\mathsf{#1}}}
\begin{document}

% \setcrambond{2pt}{}{}
% \setatomsep{2em}
\chemfig{
  HO-[2,.5,2]?<[7,.7](-[2,.5]OH)-[,,,,line width=2.4pt](-[6,.5]OH)>[1,.7]
    (-[:-65,.7]O-[:65,.7]?[b](-[2,.7]CH_2OH)<[:-60,.707](-[6,.5]OH)
      -[,,,,line width=2.4pt](-[2,.5,,2]HO)>[:60,.707](-[6,.5]CH_2OH)-[:162,.9]O?[b])
  -[3,.7]O-[4]?(-[2,.3]-[3,.5]HO)}

\end{document}