1. School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, People's Republic of China
2. Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, People's Republic of China
3. Key Laboratory of Glycoscience & Glycotechnology of Shandong Province, Qingdao 266003, People's Republic of China
4. Key Laboratory of Marine Drugs, Ministry of Education of China, Qingdao 266003, People's Republic of China