1. Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
2. Department of Anatomy, School of Basic Medical Science, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
3. Science Department of Chemistry, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China