1. Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA (U.K.) edward.
2. Syngenta Ltd. Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY (U.K.)
3. AstraZeneca, Alderley Park, Macclesfield, SK10 4TF (U.K.)