1. Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, California 94158, United States
2. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
3. Chemical Engineering, Stanford University, Stanford, California 94305, United States
4. Stanford ChEM-H, Stanford University, Stanford, California 94305, United States