1. Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire EN11 9BU, U.K.
2. Global Process Chemistry, Merck Research Laboratories, Rahway, New Jersey 07065, United States
3. Department of Chemical Process Development and Commercialization, Merck and Co., Rahway, New Jersey, 07065, USA
4. WuXi APPTec (Shanghai) Pharmaceutical Co. Ltd., 288 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai 200131, China