1. Department of Pharmacognosy
2. Department of Medicinal Chemistry
3. National Center for Natural Products Research, School of Pharmacy
4. Department of Pharmacology, Chicago College of Osteopathic Medicine, Midwestern University, Downers Grove, Illinois 60515
5. Institute of Biochemistry, National Yang-Ming University, Taipei, Taiwan, Republic of China
6. Department of Chemistry and Applied Biosciences, ETH Zurich, Ch-8093 Zurich, Switzerland
7. Institute of Biochemistry and Molecular Medicine, University of Bern, CH-3012 Bern, Switzerland