1. Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, University of Minnesota College of Pharmacy─Twin Cities, Minneapolis, Minnesota55414, United States
2. Medical Scientist Training Program, University of Minnesota Medical School─Twin Cities, Minneapolis, Minnesota55455, United States
3. Drug Discovery Department, Moffitt Cancer Center, Tampa, Florida33612, United States
4. Department of Pharmacology, University of Minnesota Medical School─Twin Cities, Minneapolis, Minnesota55455, United States