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Abstract
Two new aromatic lactones, 6-hydroxy-4-hydroxymethyl-8-methoxy-3- methylisocoumarin (1) and 1,10-dihydroxy-8-methyl-dibenz[b, e]oxepin-6,11-dione (2), together with two known compounds, 1,10-dihydroxy-dibenz[b, e]oxepin-6,11-dione (3) and 3-hydroxymethyl-6,8-dimethoxycoumarin (4), were isolated from a mangrove endophytic fungus (No. GX4-1B) collected from the South China Sea. Their structures were elucidated and the data of (1)H and (13)C NMR were assigned completely by HREIMS, 1D and 2D NMR experiments including HMQC, HMBC and NOESY.
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