1. State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources
2. School of Chemistry and Pharmaceutical Sciences
3. Guangxi Normal University
4. Guilin 541004
5. P. R. China
6. College of Chemistry and Pharmaceutical Engineering
7. Nanyang Normal University
8. Nanyang 473061
9. Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials
10. College of Chemistry and Bioengineering
11. Guilin University of Technology