1. State Key Laboratory of Molecular Engineering of Polymers
2. Department of Macromolecular Science
3. Fudan University
4. Shanghai 200433
5. China
6. Division of Theoretical Chemistry
7. Biology School of Biotechnology
8. KTH Royal Institute of Technology
9. SE-10691 Stockholm
10. Sweden
11. Key Laboratory for Advanced Materials
12. Institute of Fine Chemicals
13. East China University of Science and Technology
14. Shanghai 200237