1. Washington University, Departments of
Chemistry, Genetics, and Medicine, Saint Louis,
Missouri 63110, United States
2. The Scripps Research Institute, Departments of Chemistry, Molecular Biology,
and Center for Metabolomics, La Jolla, California, United States
3. University of Akron, Departments of Chemistry and Biology, Akron, Ohio 44325, United
States
4. University of California, San Diego, Skaggs School of Pharmacy
and Pharmaceutical Sciences,
La Jolla, California 92093, United States