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, PR China
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, PR China
3. State Key Laboratory of Gansu Advanced
Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou, 730050, PR China