Affiliation: | 1. Department of Chemistry, University of Hamburg, Organic Chemistry, Martin‐Luther‐King‐Platz 6, 20146 Hamburg (Germany);2. Present address: Institute of Physiology, ETH Zürich, Winterthurerstrasse 190, 8057 Zürich (Switzerland);3. Institute of Chemistry, University of Luebeck, Ratzeburger Allee 160, 23538 Luebeck (Germany) |