1Department of Pharmaceutical Chemistry, University of California at San Francisco, Sandler Center, 675 Nelson Rising Lane, San Francisco, California 94158, United States
2Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, United States
3Department of Cellular and Molecular Pharmacology, Howard Hughes Medical Institute, University of California at San Francisco, San Francisco, California 94158, United States
4Helen Diller Family Comprehensive Cancer Centre and Preclinical Therapeutics Core, University of California at San Francisco, San Francisco, California 94158, United States