1. Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA
2. Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA
3. Department of Biology, Georgia State University, Atlanta, Georgia 30303, USA
4. Departments of Infectious Diseases and Hematology, Kumamoto University Graduate School of Biomedical Sciences, Kumamoto 860-8556, Japan
5. Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo 162-8655, Japan
6. Experimental Retrovirology Section, HIV and AIDS Malignancy Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA