1. Institute of Chinese Medicine, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, P. R. China
2. Institute of New Medicine Research, Nanjing Hicin Pharmaceutical Co. Ltd., Nanjing 210046, P. R. China
3. State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, P. R. China