1. Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
2. Center for Integrative Chemical Biology and Drug Discovery, Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
3. Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
4. Integrated Program for Biological and Genome Sciences and Departments of Biochemistry and Microbiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States