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Two new coumarin derivatives, 4,4'-dimethoxy-5,5'-dimethyl-7,7'-oxydicoumarin ( 1 ), 7-(γ,γ-dimethylallyloxy)-5-methoxy-4-methylcoumarin ( 2 ), a new chromone derivative, ( S )-5-hydroxy-2,6-dimethyl-4 H -furo[3,4-g]benzopyran-4,8(6 H )-dione ( 5 ), and a new sterone derivative, 24-hydroxylergosta-4,6,8(14),22-tetraen-3-one ( 6 ), along with two known bicoumarins, kotanin ( 3 ) and orlandin ( 4 ), were isolated from an endophytic fungus Aspergillus  clavatus (collection No. R7), isolated from the root of Myoporum bontioides collected from Leizhou Peninsula, China. Their structures were elucidated using 1D- and 2D- NMR spectroscopy, and HRESIMS. The absolute configuration of compound 5 was determined by comparison of the experimental and calculated electronic circular dichroism (ECD) spectra. Compound 6 significantly inhibited the plant pathogenic fungi Fusarium oxysporum , Colletotrichum musae and Penicillium italicum , compound 5 significantly inhibited Colletotrichum musae , and compounds 1 , 3 and 4 greatly inhibited Fusarium oxysporum , showing the antifungal activities higher than those of the positive control, triadimefon.

Identification and Antifungal Activity of Compounds from the Mangrove Endophytic Fungus Aspergillus clavatus R7