1. Chemistry
Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.
2. Departament
de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
3. AstraZeneca Pharmaceutical Techology and Development, Charter Way, Macclesfield,
Cheshire SK10 2NA, U.K.