1. a The Third Institute of Oceanography of the State Oceanic Administration , Xiamen , People's Republic of China
2. b Department of Pharmaceutical Science, Medical College , Xiamen University , Xiamen , People's Republic of China
3. c Department of Chemistry, Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering , Xiamen University , Xiamen , People's Republic of China
4. d The Key Laboratory for Bioorganic Phosphorus Chemistry and Chemical Biology, National Ministry of Education, Department of Chemistry , Tsinghua University , Beijing , People's Republic of China