1. CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, P. R. China
2. Gansu Institute for Drug Control, Key Laboratory for Quality Control of Chinese Medicinal Materials and Decoction Pieces, State Drug Administration, Lanzhou 730000, P. R. China
3. University of Chinese Academy of Sciences, Beijing, P. R. China