1. Guangdong Key Laboratory for Research and the Development of Natural Drugs, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
2. The Marine Biomedical Research Institute of Guangdong, Zhanjiang, Guangdong 524023, China
3. Department of Chemistry, School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210009, China