Aureobasidin, New Antifouling Metabolite from Marine-Derived Fungus Aureobasidium sp

Two antifouling compounds, aureobasidin (1), a new ester with an unusual 4,6-dihydroxydecanoic acid residue, and (3R,5S)-3,5-dihydroxydecanoic acid (2), were isolated from the marine-derived fungus Aureobasidium sp., in addition to (5R,3Z)-5-hydroxydec-3-enoic acid (3) and (R)-3-hydroxydecanoic acid (4). The structures were unambiguously established by IR, 1D and 2D NMR spectroscopic and mass spectral data. Compounds 1-3 were found to be active against Bacillus subtilis, Escherichia coli and Staphyllococcus aureus. Compound 3 showed fungistatic activity against Candida albicans.