1. Medicinal Chemistry, Department of Pharmacy and Pharmacology and Sterix Ltd., University of Bath, Claverton Down, Bath, BA2 7AY, U.K., Endocrinology and Metabolic Medicine and Sterix Ltd., Faculty of Medicine, Imperial College London, St. Mary's Hospital, London, W2 1NY, U.K., and Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, U.K.