1. Process Chemistry, Gilead Sciences, 333 Lakeside Drive, Foster City, California 94404, United States
2. Chemical Development, Boehringer-Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Rd/PO Box 368, Ridgefield, Connecticut 06877-0368, United States
3. Chemical Development, Pharmaceutical Development, AstraZeneca R&D, Macclesfield, Cheshire SK10 2NA, U.K.