1. Institute of Organic Chemistry
2. University of Würzburg
3. D-97074 Würzburg
4. Germany
5. Faculté des Sciences
6. Université de Kinshasa
7. Kinshasa XI
8. Democratic Republic of the Congo
9. Swiss Tropical and Public Health Institute
10. CH-4002 Basel
11. Switzerland
12. University of Basel
13. CH-4003 Basel
14. Division of Natural Drug Discovery
15. Institute of Natural Medicine
16. University of Toyoma
17. Toyama 930-0194
18. Japan