1. Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, Departments of Cellular and Molecular Physiology and of Pharmacology, Milton S. Hershey Medical Center, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, Southern Research Institute, Birmingham, Alabama 35225-5305, Drug Discovery Program, H. Lee Moffitt Cancer Center & Research Institute, Tampa, Florida 33612, Departments of Chemistry and Oncologic Sciences, University of South...