Compound labels in headers

[Clemens Niederberger]

The number vanishes in the header:

\documentclass{article}

\usepackage{chemnum}
\usepackage{fancyhdr}
\pagestyle{headings}
\cmpdsetup{cmpd-delim=()}

\begin{document}

\section{Test \cmpd+{test}}

\cmpd{test}

\end{document}

[Clemens Niederberger]

This is due to \MakeUppercase in \sectionmark => not chemnum's fault