1. Division
of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, 500 West 12th Avenue, Columbus, Ohio 43210, United States
2. Division
of Pharmacy Practice and Administration, College of Pharmacy, The Ohio State University, 500 West 12th Avenue, Columbus, Ohio 43210, United States
3. Nuclear
Magnetic Resonance Facility, Campus Chemical Instrument Center, The Ohio State University, Columbus, Ohio 43210, United States
4. Department
of Pharmacy, University of Zimbabwe, Harare, Zimbabwe
5. Department
of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
6. Field Museum of
Natural History, Chicago, Illinois 60605, United States