1. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry & Chemical Engineering of Guangxi Normal University, Guilin 541004, P. R. China
2. Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
3. Department of Chemistry, Northwest University, Xi’an 710069, P. R. China
4. Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangzhou 510275, P. R. China