1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, P. R. China
2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
3. Department of Neurology and Stroke Center, The First Affiliated Hospital and Department of Chemistry, Jinan University, Guangzhou 510632, P. R. China