1. Research Center for Marine Drugs, School of Pharmacy; Second Military Medical University; 325 Guo-He Road Shanghai 200433 P. R. China
2. Department of Organic Chemistry; University of Debrecen; P.O.B.: 20 H-4010 Debrecen Hungary
3. Institut für Mikrobiologie; Technische Universität Braunschweig; Spielmannstraße 7 31 806 Braunschweig Germany
4. Department Chemie; Universität Paderborn; Warburger Straße 100 33098 Paderborn Germany
5. Shanghai Key Laboratory of Molecular Medical Mycology, Institute of Dermatology and Mycology, Changzheng Hospital; Second Military Medical University; Shanghai 200003 P. R. China