1. School of Science, China Pharmaceutical University, 639 Longmian Avenue, Nanjing 211198, P. R. China
2. State Key Laboratory of Neurology and Oncology Drug Development, Jiangsu Simcere Pharmaceutical Co., Ltd., 699-18 Xuan Wu Avenue, Nanjing 210042, P. R. China
3. Jiangsu Simcere Pharmaceutical Co., Ltd., 699-18 Xuan Wu Avenue, Nanjing 210042, P. R. China
4. State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, P. R. China
5. Simcere Zaiming Pharmaceutical Co., Ltd., 699-18 Xuan Wu Avenue, Nanjing 210042, P. R. China