1. Graduate Program in Cancer Biology, Wayne State University School of Medicine, Detroit, Michigan 48201, Division of Medicinal Chemistry, Graduate School of Pharmaceutical Sciences, Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, Department of Pharmacology, Wayne State University School of Medicine, Detroit, Michigan 48201, Developmental Therapeutics Program, Barbara Ann Karmanos Cancer Institute, 110 East Warren Ave, Detroit, Michigan 48201