The fungus, Aspergillus nidulans BF0142, was isolated from hot spring-derived soil collected at Hell Valley in Noboribetsu, Hokkaido, Japan. A new furanone compound designated helvafuranone (1) was isolated along with microperfuranone (2), 9-hydroxymicroperfuranone (3), diorcinol (4), emestrin (5), and sterigmatocystin (6) from a culture broth of A. nidulans BF0142. The structure of 1 was elucidated as 5-hydroxy-4-(4-hydroxybenzyl)-3-(4-hydroxybenzyl)furanone based on various NMR experiments and chemical modifications.
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