1. Ralph N. Adams Institute for Bioanalytical Chemistry and Department of Chemistry, University of Kansas, Multidisciplinary Research Building, 2030 Becker Drive, Room 220 E, Lawrence, Kansas 66047, Moffitt Cancer Center, 12902 Magnolia Drive, Tampa, Florida 33612, Department of Science and Engineering, School of Medicine, Oregon Health and Science University, Beaverton, Oregon 97006-8921, and Department of Medicinal Chemistry, University of Kansas, 4040a Malott Hall, Lawrence, Kansas 66045