1. Shaanxi Key Laboratory of Degradable Biomedical Materials
2. Shaanxi R&D Center of Biomaterials and Fermentation Engineering
3. School of Chemical and Engineering
4. Northwest University
5. Xi'an
6. Department of Chemistry
7. Nanchang University
8. Nanchang 330031
9. China
10. Key laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education
11. Shaanxi Key Laboratory of Physico-Inorganic Chemistry
12. College of Chemistry & Materials Science
13. Deparment of Chemistry
14. Tsinghua University
15. Beijing
16. P. R. China