\documentclass{article} \usepackage{chemfig} \begin{document} \def\test#1{#1} \test{\chemfig{~[:30]}}\par\medskip \test{\chemfig{()~[:30]}} \end{document}
Gute Nacht!
\documentclass{article} \usepackage{chemfig} \begin{document} \def\test#1{#1} \test{\chemfig{~[:30]}}\par\medskip \test{\chemfig{()~[:30]}} \end{document}