The structure of a new sesterterpene metabolite isolated from an unclassified Carteriospongia sp. has been assigned from X-ray crystallographic evidence. The compound has been indentified as (20S,24S)-20-acetoxy-12β-hydroxy-20,24-dimethyl-25-norscalar-17-ene-18,24-carbolactone (4). The absolute configuration is taken to be that found for other scalaranes from Phyllospongia spp.
K. D. Croft, E. L. Ghisalberti, B. W. Skelton and A. H. White, J. Chem. Soc., Perkin Trans. 1, 1983, 155 DOI: 10.1039/P19830000155
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