1. Department
of Chemistry, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.
2. Pfizer
Neuroscience and Pain Research Unit, Worldwide Medicinal Chemistry, Portway Building, Granta Park, Great Abington, Cambridge CB21 6GS, U.K.
3. Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K.