1. 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
2. Neuronal Signal Transduction, Max Planck Florida Institute for Neuroscience, Jupiter, Florida 33458, United States
3. Division of Oral and Craniofacial Health Sciences, UNC Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
4. Department of Tumor Biology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612, United States
5. Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States