1. Institute of Physical and Theoretical Chemistry, Goethe-University Frankfurt am Main, Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany
2. Science Institute, University of Iceland, Dunhaga 3, 107 Reykjavik, Iceland
3. Institute for Organic Chemistry and Chemical Biology, Goethe-University Frankfurt am Main, Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany
4. Department of Biology, Technical University Darmstadt, Schnittspahnstraße 10, 64287 Darmstadt, Germany