1. Technische Universität Darmstadt, Department of Biology, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
2. Goethe-University Frankfurt, Institute for Organic Chemistry and Chemical Biology, Max-von-Laue-Strasse 9, 60438 Frankfurt (M), Germany
3. Goethe-University Frankfurt, Institute for Physical and Theoretical Chemistry, Max-von-Laue-Strasse 7, 60438 Frankfurt (M), Germany