1. Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
2. Laboratory for Fluorescence Dynamics, Biomedical Engineering, University of California, Irvine, California 92697, United States
3. Resource for Native MS Guided Structural Biology, The Ohio State University, Columbus, Ohio 43210, United States
4. Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
5. Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697, United States