1. Process Research and Development, Merck & Co., Inc., Boston, Massachusetts 02115, United States
2. Process Research and Development, MSD, Hertford Road, Hoddesdon, Hertfordshire EN11 9BU, U.K.
3. Process Research and Development, Merck & Co., Inc., P.O. Box 2000, Rahway, New Jersey 07065-0900, United States
4. Pharmaron Beijing, Co. Ltd., No. 6 TaiHe Road, BDA, Beijing 100176, China