| new bioactive rosigenin analogues and aromatic polyketide metabolites from the freshwater aquatic fungus massarina tunicata. | four new rosigenin analogues (massarigenins a-d; 1-4) and two new aromatic polyketide-derived secondary metabolites (massarinins a and b; 6, 7) and have been isolated from the freshwater aquatic fungus massarina tunicata. the structures of these compounds were determined primarily by analysis of nmr data, and that of compound 1 was verified by x-ray crystallography. the known compound 4-(2-hydroxybutynoxy)benzoic acid (11) was also obtained, and its absolute stereochemistry was assigned. several ... | 2003 | 12542349 |