1. Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
2. Department of Chemistry, East Carolina University, Greenville, North Carolina 27858, United States
3. Department of Pharmaceutical Chemistry, School of Pharmacy, University of California, San Francisco, San Francisco, California 94143, United States
4. QB3/Chemistry Mass Spectrometry Facility, University of California, Berkeley, Berkeley, California 94720, United States
5. Department of Urology, University of Toledo, Health Science Campus, Toledo, Ohio 43614, United States