1. Research Center for Marine Drugs,
School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, People’s Republic of China
2. Pharmaceutical College of Henan University, Kaifeng 475001, People’s
Republic of China
3. Department
of Organic Chemistry, University of Debrecen, POB 20, H-4010 Debrecen, Hungary
4. Institut für Mikrobiologie, Technische Universität Braunschweig, 31806 Braunschweig, Germany