1. 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 730000 People's Republic of China
2. Centre of Resource Chemical and New Material; Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences; Qingdao 266100 People's Republic of China
3. Department of Pharmacy, Key Laboratory of Chemistry and Quality for Traditional Chinese Medicines of the College of Gansu Province, Gansu College of Traditional Chinese Medicine; Lanzhou 730000 People's Republic of China