1. Key Laboratory of Green Chemistry and Technology (Ministry of Education)
2. College of Chemistry
3. Sichuan University
4. Chengdu 610064
5. PR China
6. Department of Operative Dentistry and Endodontics
7. Guanghua School of Stomatology and Institute of Stomatological Research
8. Sun Yat-sen University
9. Guangzhou
10. China