1. Department of Pharmacognosy; School of Pharmacy; Fudan University; Shanghai 201203 P. R. China
2. State Key Laboratory of Drug Research; the National Center for Drug Screening; Shanghai Institute of Materia Medica; Chinese Academy of Sciences; Shanghai 201203 P. R. China
3. University of Chinese Academy of Sciences; No.19 A Yuquan Road Beijing 100049 P. R. China