1. Department of Chemistry and Department of Medicinal Chemistry Purdue University West Lafayette IN 47907 USA
2. Departments of Biology and Chemistry, Molecular Basis of Disease Georgia State University Atlanta GA 30303 USA
3. Experimental Retrovirology Section, HIV and AIDS Malignancy Branch National Cancer Institute Bethesda MD 20892 USA
4. Department of Refractory Viral Infections National Center for Global Heath and Medicine Research Institute Shinjuku Tokyo 162-8655 Japan
5. Departments of Hematology and Infectious Diseases Kumamoto University School of Medicine Kumamoto 860-8556 Japan