1. Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
2. Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0657, United States
3. Department of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0365, United States