1. School of Chemistry and Chemical Engineering, Sun Yat-sen University, No. 135, West Xingang Road, Guangzhou 510275, P.R. China
2. Tibet Plateau Institute of Biology, No. 19, West Beijing Road, Lhasa 850001, P.R. China
3. Zhongshan School of Medicine, Sun Yat-sen University, No. 135, West Xingang Road, Guangzhou 510275, P.R. China
4. School of Pharmaceutical Sciences, Sun Yat-sen University, No. 135, West Xingang Road, Guangzhou 510275, P.R. China