1. 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
2. University of Chinese Academy of Sciences; Beijing 100049 P. R. China
3. State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilisation, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences; Urumqi 830011 P. R. China