1. Masonic Cancer Center, University of Minnesota, 2231 6th Street SE, Minneapolis, Minnesota 55455, United States
2. Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
3. Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
4. Division of Environmental Health Sciences, School of Public Health, University of Minnesota, Minneapolis, Minnesota 55455, United States