1. Institute of Marine Drugs, Guangxi University of Chinese Medicine, Nanning, P.R. China
2. Guangxi Zhuang Yao Medicine Center of Engineering and Technology, Nanning, P.R. China
3. School of Chemistry, Sun Yat-sen University, Guangzhou, P.R. China
4. School of Life Science, Sun Yat-sen University, Guangzhou, P.R. China