1. National Demonstration Center for Experimental Chemistry Education, Hunan Engineering Laboratory for Analyse and Drugs Development of Ethnomedicine in Wuling Mountains, Jishou University, Jishou 416000, P. R. China
2. School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, P. R. China
3. The State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, 222 Tianshui Road, Lanzhou 730000, P. R. China