1. Chair
for Chemistry of Biopolymers, Technische Universität München, Weihenstephaner Berg 3, 85354 Freising, Germany
2. Leibniz Institute for Analytical Sciences ISAS, e.V., Otto-Hahn-Strasse 6b, 44227 Dortmund, Germany
3. Laboratory
of Chemical Biology, Department of Cellular and Molecular Medicine, University of Leuven, Herestraat 49, 3000 Leuven, Belgium