About the Authors

Mohamed Bessat

Affiliation Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, California, United States of America

Giselle Knudsen

Affiliation Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, California, United States of America

Alma L. Burlingame

Affiliation Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, California, United States of America

Ching C. Wang

ccwang@cgl.ucsf.edu

Affiliation Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Performed the LC-MS/MS: GK MB. Conceived and designed the experiments: CCW MB. Performed the experiments: MB GK. Analyzed the data: MB GK. Contributed reagents/materials/analysis tools: CCW ALB. Wrote the paper: MB CCW.