1. Department of Chemistry and Catalysis Research Center (CRC); Technical University Munich; Lichtenbergstrasse 4 85747 Garching Germany
2. Institute of Organic Chemistry; University of Regensburg; Universitätsstraße 31 93053 Regensburg Germany
3. Department of Chemistry, Center for Integrated Protein Science; Technical University Munich; Lichtenbergstrasse 4 85747 Garching Germany