1. Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao Shandong 266003 China
2. State Key Laboratory of Microbial Technology, Shandong University Qingdao Shandong 266237 China
3. Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology Qingdao Shandong 266235 China