1. School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
2. Biopharmaceutical R&D Center, Jinan University, Guangzhou 510632, P. R. China
3. Department of Neurology, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road II, Guangzhou, 510080, P. R. China
4. Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510089, P. R. China