1. Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
2. Department of Pathology, School of Medicine, Stanford University, Stanford, California 94305, United States
3. Department of Medicine, UCSD School of Medicine, La Jolla, California 92093, United States
4. Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California 92037, United States
5. Sarafan ChEM-H, Stanford University, Stanford, California 94305, United States