1. Institute for Organic Chemistry and Biochemistry Technical University of Darmstadt Alarich‐Weiss‐Straße 4 Darmstadt D‐64287 Germany
2. Ferring Darmstadt Laboratory Biologics Technology and Development Alarich‐Weiss‐Straße 4 Darmstadt D‐64287 Germany
3. Ferring International Center S.A. Chemin de la Vergognausaz 50 Saint‐Prex CH‐1162 Switzerland