1. Department of Nanobiophotonics Max Planck Institute for Biophysical Chemistry (MPIBPC) Am Fassberg 11 37077 Göttingen Germany
2. Present address: Artesan Pharma GmbH Germany
3. Present address: Institut für organische und biomolekulare Chemie der Georg-August-Universität Göttingen Germany
4. Facility for Synthetic Chemistry MPIBPC Germany