1. Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, Toxicology and Pharmacology Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute at Frederick, National Institutes of Health, Frederick, Maryland 21702, Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia 22908, and Department of Oncology, Drug Discovery Program, Georgetown University Medical Center,...