\documentclass[a4paper,12pt]{report}
\usepackage{german,echem}

\begin{document}
Bindungsverh"altnisse im Sauerstoff:
\mbox{\hdl[\echhbar]{O}\hdu[\echhbar]{O}O\vdd{O}
  \vdd{O}\hdl[\echhbar]{O}\hdu[\echhbar]{O}O};
auch als Fu"snote\footnote{Bindungsverh"altnisse im Sauerstoff:
 \mbox{\hdl[\echhbar]{O}\hdu[\echhbar]{O}O\vdd{O}
  \vdd{O}\hdl[\echhbar]{O}\hdu[\echhbar]{O}O}.} einsetzbar.
\end{document}

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