1. Departments of Internal Medicine and Medicinal Chemistry and Comprehensive Cancer Center, and Life Sciences Institute, University of Michigan, 1500 East Medical Center Drive, Ann Arbor, Michigan 48109, Laboratory of Medicinal Chemistry, National Cancer Institute-Frederick, National Institutes of Health, Frederick, Maryland 21702, Lombardi Cancer Center, Georgetown University Medical Center, Washington, D.C. 20007, The Laboratory for the Structure of Matter, Naval Research Laboratory, 4555 Overlook Avenue...