1. Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, BA2 7AY, U.K.
2. Institut de Recherche Henri Beaufour, Ipsen, 91966 Les Ulis Cedex, France
3. Diabetes, Endocrinology and Metabolism, Imperial College London, Hammersmith Hospital, London, W12 0NN, U.K.