1. Division of Medicinal Chemistry and Natural Products, University of North Carolina Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599-7568
2. Epilepsy Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, 6001 Executive Boulevard, Suite 2106, Rockville, Maryland 20892
3. Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290