1. Department of Computational & Structural Sciences, SmithKline Beecham Pharmaceuticals, New Frontiers Science Park, Third Avenue, Harlow, Essex, England CM19 5AW, Departments of Medicinal Chemistry and Neurobiology Research, SmithKline Beecham S.p.A., Via Zambeletti, 20021 Baranzate, Milano, Italy, SmithKline Beecham Laboratoires Pharmaceutiques, Unité de Recherche, 4, rue du ChesnayBeauregard, Boite Postale 96205, F-35762 St. Gregoire, France, and Department of Pulmonary Biology, SmithKline Beecham...