1. Department of Pharmaceutical Chemistry, UC San Francisco, San Francisco, California 94158, United States
2. Department of Chemistry, Center for Structural Biology, Vanderbilt University, 465 21st Avenue South, Nashville, Tennessee 37203, United States
3. Department of Microbiology and Immunology, UC San Francisco, San Francisco, California 94158, United States
4. QB3 Institute, UC Berkeley, Berkeley, California 94720, United States