1. Key Laboratory of Synthetic Chemistry of Natural SubstancesCenter for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
2. University of Chinese of Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
3. Jiangsu Key Laboratory of Chiral Drug DevelopmentJiangsu Aosaikang Parmaceutical CO., LTD. Nanjing 211112 P. R. China