1. Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy; Ocean University of China; Qingdao 266003 China
2. Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology; Qingdao 266003 China
3. Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chirosciences; The Hong Kong Polytechnic University; Hong Kong