1. Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
2. Faculty of Pharmaceutical Sciences, University of Kinshasa, B.P. 212 Kinshasa XI, Democratic Republic of the Congo
3. Medicinal Chemistry, Bayer AG, Pharmaceuticals, Aprather Weg 18a, D-42096 Wuppertal, Germany
4. Federal Institute for Risk Assessment, Max-Dohrn-Straße 8-10, D-10589 Berlin, Germany
5. Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo
6. Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland
7. University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland
8. Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan