1. Chemical Reseach and Development, Pfizer Global R&D, 10578 Science Center Drive, San Diego, California 92121, U.S.A., Chemical Research and Development, Pfizer Global R&D, Eastern Point Road, Building 100, Groton, Connecticut 06340 U.S.A., Chemical Reseach and Development, Pfizer Global R&D, Ramsgate Road, Sandwich, England CT13 9NJ, Analytical Reseach and Development, Pfizer Global R&D, 10578 Science Center Drive, San Diego California, 92121, U.S.A.