1. ElexoPharm GmbH, Im Stadtwald, Building A1.2, 66123 Saarbrücken, Germany
2. Chemistry of Natural and Microbial Products Department, National Research Centre, Dokki, 12622 Cairo, Egypt
3. Department of Pharmaceutical and Medicinal Chemistry, Saarland University, 66123 Saarbrücken, Germany
4. PharmBioTec GmbH, 66123 Saarbrücken, Germany
5. Institute of Pharmaceutical Chemistry, Philipps-University, 35032 Marburg, Germany
6. Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
7. Institute for Zoology, Molecular Cell Physiology and Endocrinology, Technical University Dresden, 01062 Dresden, Germany
8. Department of Drug Design and Optimization, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), 66123 Saarbrücken, Germany