1. Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London, WC1H OAJ U.K., Department of Biochemistry and Molecular Biology, University College London, Darwin Building, Gower Street, London WC1E 6BT, U.K., Bloomsbury Centre for Structural Biology, Department of Biochemistry and Molecular Biology, University College London, Gower Street, London WC1E 6BT, U.K., Pfizer Limited, Sandwich, Kent CT13 9NJ, U.K., Department of Chemistry, Imperial College London,...