A novel compound, nafuredin, was isolated as an inhibitor of anaerobic electron transport (NADH-fumarate reductase). It was obtained from culture broth of Aspergillus niger FT-0554 isolated from a marine sponge. The structure was elucidated as an epoxy-delta-lactone with an attached methylated olefinic side chain on the basis of spectral analysis.
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Ui et al. (2001) studied this question.