1. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
2. Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
3. Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
4. Departments of Medicinal Chemistry, Chemistry, and Microbiology & Immunology, University of Michigan, Ann Arbor, Michigan 48109, United States