1. School of Chemistry, Sun Yat-sen University, Guangzhou 510006, China
2. School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
3. College of Science, Shantou University, Shantou 515063, China
4. State Key Laboratory of Applied Microbiology Southern China, Guangdong Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
5. School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China