参考文献:
MERCK SHARP and DOHME CORP. LIU, Kun STACHEL, Shawn J. COBURN, Craig A. STEELE, Thomas G. SOLL, Richard WU, Hao PENG, Xuanjin CAI, Yaxian DU, Xiaoxing LI, Jian Patent: WO2010/94242 A1, 2010 Location in patent: Preparation II.1 WO 2010/094242 A1