1. Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, U.K., International Flavors and Fragrances (IFF-R & D), 1515 State Highway 36, Union Beach, New Jersey 07735, and Merck, Sharp & Dohme Ltd., Neuroscience Research Centre, Terlings Park, Eastwick Road, Harlow, Essex CM20 2QR, U.K.