1. Department
of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
2. Department
of Physiology, Medical School of Nanchang University, Nanchang 330006, P. R. China
3. Department
of Chemistry and the Tsinghua Center for Frontier Polymer Research, Tsinghua University, Beijing, 100084, P. R. China