1. Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
2. Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37240, United States
3. Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37240, United States
4. Institute for Drug Discovery, Leipzig University, Leipzig, SAC 04103, Germany
5. Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235, United States
6. Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States