1. Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, Program for Collaborative Research in the Pharmaceutical Sciences and Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, Institute of Traditional Medicine, Muhimbili University College of Health Sciences, Dar es Salaam, Tanzania, and National Cancer Institute, NCI-Frederick, Fairview Center, P.O. Box B,...