Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 8, Issue 2, Pages 407-412Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b915624k
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- Australian Research Council and PharmaMar (Madrid, Spain)
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Chemical investigation of a southern Australian marine sponge, Clathria sp., yielded the known mirabilins C, F and G, together with three new analogues, mirabilins H-J. For the first time mirabilins C and F are documented as the underivatized natural products, and a complete absolute stereochemistry is assigned to mirabilin F. Mirabilin I represents the first member of this structure class to incorporate a trans-fused ring junction. Structures for all mirabilins are assigned on the basis of detailed spectroscopic analysis. A plausible polyketide origin is proposed, linking all mirabilins and related sponge alkaloids. Mirabilin cytotoxicity against several human cancer cell lines is discussed.
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