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 Gansu P. R. China
2. Center of Resource Chemical & New Material; Qingdao Shandong P. R. China
3. Food and Agriculture Standardization Institute; China National Institute of Standardization; Beijing P. R. China
4. University of Chinese Academy of Sciences; Beijing P. R. China