1. School of Life Sciences, Shanghai University, Shanghai 200444, P. R. China
2. State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, P. R. China
3. School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, P. R. China
4. University of Chinese Academy of Sciences, Beijing 100049, P. R. China