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. Departments of Hematology and Infectious Diseases; Kumamoto University School of Medicine; Kumamoto 860-8556 Japan
4. Experimental Retrovirology Section, HIV and AIDS Malignancy Branch; National Cancer Institute; Bethesda MD 20892 USA
5. Center for Clinical Sciences; National Center for Global Heath and Medicine; Shinjuku Tokyo 162-8655 Japan