Abstract
Abstract Iriomoteolide-13a (1) has been isolated from a benthic dinoflagellate Amphidinium sp. (strain KCA09053) as a new 22-membered macrolide containing one hexahydrofuro[3,2-b]furan ring, one tetrahydropyran ring, two tetrahydrofuran rings, three one-carbon branches, and three hydroxyl groups including two hemiketals. The structure of 1 was assigned on the basis of a detailed 2D NMR analysis. Compound 1 exhibited cytotoxic activity against human cervix adenocarcinoma HeLa cells (IC50: 0.5 μg/mL).
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