1. Institute for Pharmaceutical Biology, University of Bonn, 53115 Bonn, Germany
2. Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Egypt
3. Institute of Inorganic Chemistry, Department of X-ray Crystallography, University of Bonn, 53121 Bonn, Germany
4. Department of Chemical Biology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
5. Pharmaceutical Chemistry I, Pharmaceutical Institute, University of Bonn, 53121 Bonn, Germany