1. Department of Molecular Medicine, Scripps Research, 10550 N Torrey Pines Rd., La Jolla, CA 92037, USA
2. Department of Chemistry, Scripps Research, 10550 N Torrey Pines Rd., La Jolla, CA 92037, USA
3. Skaggs Graduate School of Chemical and Biological Sciences, Scripps Research, 10550 N Torrey Pines Rd., La Jolla, CA 92037, USA