1. Department of Chemistry University of Virginia Charlottesville, Virginia 22904, United States
2. Division of Clinical Pharmacology, Department of MedicineVanderbilt University Medical Center, Nashville, Tennessee 37240, United States
3. Institute of Drug Discovery, Faculty of MedicineUniversity of Leipzig, Leipzig, SAC 04103, Germany
4. Center for Structural Biology Vanderbilt University, Nashville, Tennessee 37232, United States
5. Department of Chemistry Vanderbilt University, Nashville, Tennessee 37232, United States