1. Department of Chemistry, NC State University, Raleigh, North Carolina 27695, United States
2. Comparative Medicine Institute, NC State University, Raleigh, North Carolina 27695, United States
3. Life Sciences Institute, Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
4. Department of Chemistry and Department of Microbiology & Immunology, University of Michigan, Ann Arbor, Michigan 48109, United States