1. School of Pharmaceutical Sciences Southern Medical University 1838 Guangzhou Avenue North Guangzhou 510515 China
2. Marine Drugs Research Center College of Pharmacy Jinan University 601 Huangpu Avenue West Guangzhou 510632 China
3. College of Life Science and Technology Jinan University 601 Huangpu Avenue West Guangzhou 510632 China
4. Department of Organic Chemistry University of Debrecen PO Box 400 4002 Debrecen Hungary