1. Chemical Development and Analytical Chemistry, GlaxoSmithKline Medicines Research Centre, Via Fleming 4, 37135 Verona, Italy, Sanofi-Aventis R&D Centre, 195 route d’Espagne BP 13669, 31036 Toulouse Cedex 1, France, and Pharmasynthese, Process Industrialization - 57 rue Gravetel, 76320 Saint Pierre lès Elbeuf, France