1. Department of Medicinal Chemistry, Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen-Cilag France, Campus de Maigremont, F-27106 Val de Reuil, France, and Department of Medicinal Chemistry, CNS Discovery Research and Department of Preclinical Pharmacokinetics, Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica N.V., Turnhoutseweg 30, B-2340 Beerse, Belgium