1. Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
2. Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
3. Automated Synthesis Facility, The Scripps Research Institute, La Jolla, California 92037, United States
4. California Institute for Biomedical Research (Calibr), La Jolla, California 92037, United States