1. College of Veterinary Medicine, Hebei Agricultural University, Baoding, Hebei 071000, P.R. China
2. Chongqing Key Laboratory of Theoretical and Computational Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, P.R. China
3. Hebei Shengxue Dacheng Pharmaceutical (Shijiazhuang) Co., Ltd, Shijiazhuang 064000, P.R. China