1. State Key Laboratory of Applied Organic Chemistry, Department of Chemistry and School of Pharmacy, Lanzhou University, Lanzhou 730000, P.R. China
2. State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730000, P.R. China
3. Gansu Province Research Center for Basic Disciplines of Biology, Lanzhou 730000, P.R. China