1. Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California 92307, United States
2. Charité−Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Medical Physics and Biophysics, Berlin 10117, Germany
3. Chemical Biology and Therapeutics Science Program, Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, United States
4. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States