参考文献:
MERCK SHARP and DOHME CORP. COBURN, Craig, A. MCCAULEY, John, A. LUDMERER, Steven, W. LIU, Kun VACCA, Joseph, P. WU, Hao HU, Bin SOLL, Richard SUN, Fei WANG, Xinghai YAN, Man ZHANG, Chengren ZHENG, Mingwei ZHONG, Bin ZHU, Jian Patent: WO2/83 A, 2 Location in patent: Page/Page column 5 WO 2/83 A