1. Scripps Center for Metabolomics
and Mass Spectrometry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United
States
2. Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United
States
3. Pfizer Worldwide Research and Development, La Jolla Laboratories, San Diego, California
92121, United States
4. Departments
of Chemistry, Genetics, and Medicine, Washington University, One Brookings Drive, St. Louis, Missouri
63130, United States