1. Division of Medicinal Chemistry, Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut 06269, United States
2. Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
3. Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan 48109, United States
4. Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States