1. a Key Laboratory of Modern Chinese Medicines, Ministry of Education and Department of Pharmacognosy , China Pharmaceutical University , Nanjing, P. R. China
2. b State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University Health Science Center , Beijing, P. R. China
3. c Key Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences , Guangzhou, P. R. China