1. Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37232, United States
2. Warren Center for Neuroscience Drug Discovery, Vanderbilt University, Nashville, Tennessee 37232, United States
3. Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232, United States
4. Chemical and Physical Biology Program, Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37232, United States
5. Institute for Drug Discovery, Leipzig University, Saxony 04109, Germany
6. Department of Biochemistry, Vanderbilt University, Nashville, Tennessee 37232, United States