1. Department of Medicinal Chemistry, The University of Kansas, Lawrence, Kansas 66045, United States
2. Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, United States
3. Department of Chemistry, University of Redlands, Redlands, California 92373, United States
4. Departments of Pharmacology and Neuroscience, School of Medicine, Creighton University, Omaha, Nebraska 68102, United States