1. Molecular Synthesis Center and Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China
2. Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, 1 Wenhai Road, Qingdao, Shandong 266237, China