1. Pharmaceutical Institute, Department of Pharmaceutical & Medicinal Chemistry, University of Bonn, Bonn 53121, Germany
2. Research Training Group 1873, University of Bonn, 53127 Bonn, Germany
3. Department of Technology and Biotechnology of Drugs, Faculty of Pharmacy, Jagiellonian University Medical College, 9 Medyczna Street, 30-688 Kraków, Poland