1. Key laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003, P.R. China
2. Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, P.R. China
3. Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai 201203, P.R. China