1. Laboratory of Medicinal Chemistry, School of Pharmacy, University of Louvain, Avenue Emmanuel Mounier, 73 (UCL 7340), B-1200 Bruxelles, Belgium, Department of Pharmacology, University of Bologna, Irnerio 48, 40126 Bologna, Italy, Antiepileptic Drug Development Program, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, and Laboratory of Medicinal Chemistry, University of Liège, Rue Fusch 3, B-4000 Liège, Belgium