1. Department of Chemistry, University of Virginia, Charlottesville, Virginia, Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, Canada, Department of Experimental Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas, CONRAD, Department of Ob/Gyn, Eastern Virginia Medical School, Norfolk, Virginia 23507, and Department of Pharmacology, University of Maryland School of Medicine, Baltimore, Maryland