A New Butyrolactone from Aspergillus sp.

Four butyrolactones were isolated from the Aspergillus sp. Their structures were identified as 8′′-hydroxy-9′′-en-butyrolactone I (1), butyrolactone VII (2), 3-hydroxy-4-(4-hydroxyphenyl)-5-methoxycarbonyl-5-(4-hydroxy-3-formylbenzyl)-2,5-dihydro-2-furanone (3), and butyrolactone III (4). Compound 1 is a new butyrolactone and its absolute configuration was determined via the Rh2(OCOCF3)4 method.