# chemfig: abbreviate a constitutional formula with round brackets

I'd like to abbreviate a constitutional formula with round brackets. In math mode it works:

\documentclass{scrartcl}
\begin{document}
$\mathrm{CH_3-(CH_2)_3-CH_3}$ instead of $\mathrm{CH_3-CH_2-CH_2-CH_2-CH_3}$
\end{document}


But how I do this within a chemfig formula?

I tried:

\documentclass{scrartcl}
\usepackage{chemfig}
\begin{document}
\end{document}


But it does not work like expected.

( and ) are special chars reserved to indicate bifurcation. You must enclose them between braces to make them invisible to the chemfig parser:
\documentclass{scrartcl}