1. Department of Medicinal Chemistry, University of Kansas, Lawrence, Kansas 66047, United States
2. Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
3. Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
4. Department of Pharmacology, University of Michigan, Ann Arbor, Michigan 48109, United States