1. Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37240, United States
2. Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37240, United States
3. Neuroscience Program, Vanderbilt University, Nashville, Tennessee 37240, United States
4. Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37240, United States
5. Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37240, United States
6. Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37240, United States