The marine fungus Pseudallescheria boydii was isolated from the inner tissue of the starfish Acanthaster planci. This fungus was cultured in a high salinity glucose-peptone-yeast extract (GPY) medium. Two new chlorinated benzofuran derivatives, 6-chloro-2-(2-hydroxypropan-2-yl)–2,3-dihydro-5-hydroxybenzofuran (1) and 7-chloro-2-(2-hydroxypropan-2-yl)–2,3-dihydro-5-hydroxybenzofuran (2), were obtained from the extract of the culture broth. Their structures were determined by analysis of the NMR and MS data.
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