1. College of Pharmacy; Jinan University; Guangzhou 510632 P. R. China
2. State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization; Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 P. R. China
3. Key Laboratory of Plant Resources and Chemistry of Arid Zone; Xinjiang Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Urumqi 830011 P. R. China