1. Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, Pennsylvania 15282; Grace Cancer Drug Center, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, New York 14263; Hauptman−Woodward Medical Research Institute, Inc., 73 High Street, Buffalo, New York 14203; Department of Biochemistry, Tufts University School of Medicine, Boston, Massachusetts 02111; and Department of Pharmacology and Toxicology, School of Medicine, Indiana University...