1. GlaxoSmithKline R&D, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K.
2. Department
of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral
Street, Glasgow, G1 1XL, U.K.
3. Centre de Recherche, GlaxoSmithKline R&D, Les Ulis, 25, 27 Avenue du Québec, 91140 Villebon sur Yvette, France