1. Department of Chemistry, UNC College of Arts and Sciences, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
2. The University of Kansas Chemical Methodologies and Library Development Center, 2034 Becker Dr., Delbert M. Shankel Structural Biology Center, Lawrence, Kansas 66047, United States
3. 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