Abstract
Ten 3-oxo-4, 6, 8(14)-triunsaturated steroids with cholestane (1, 2), ergostane (3, 4, 5, 7) and stigmastane skeletons(6, 8, 9, 10), were isolated from a sponge, Dysidea herbacea, collected off the coast of the Lakshadweep Islands, Indian Ocean. Of these, 7 to 10 were obtained as C-24 epimeric mixtures. Compound 2 had previously been reported form a sponge, Dictyonella insica. The hydroperoxide 10 was shown to be an artefact formed from the 24-ethylidene derivative 6 during storage. The structures of 1 to 10 were derived from spectroscopic evidence.
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