1. Laboratories of Medicinal Chemistry and Molecular Pharmacology, Division of Basic Sciences, National Cancer Institute, Bethesda, Maryland 20892, Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, Laboratory of Antiviral Drug Mechanisms, National Cancer Institute−Frederick Cancer Research and Development Center, SAIC Frederick, Frederick, Maryland 21702-1201, and Rega Institute for Medical Research,...