1. Department of Process Research and Development, MSD R&D (China) Co., Ltd., Building 21 Rongda Road, Wangjing R&D Base, Zhongguancun Electronic Zone West Zone, Beijing 100012, China
2. Department
of Process Research and Development, Merck Research Laboratories, P.O. Box 2000, Rahway, New Jersey 07065, United States
3. Department of Process Research and Development, Merck Sharp & Dohme, Hertford Road, Hoddesdon, Hertfordshire EN11 9BU, United Kingdom
4. Department
of Synthetic Chemistry, Pharmaron Beijing Co., Ltd., 6 Taihe Road BDA, Beijing, 100176, China