1. National Engineering Research Center for Biomaterials
2. Sichuan University
3. Chengdu
4. P. R. China
5. Department of Pharmacy
6. Institute of Organic Chemistry
7. Johannes Gutenberg-University Mainz Duesbergweg 10-14
8. 55099 Mainz
9. Germany
10. College of Materials Science and Engineering
11. Nanjing Tech University
12. Nanjing 211816