Marine sterols: 19-nor-stanols from the sponge Axinella polypoides

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Abstract
The total sterol content of the marine sponge Axinella polypoides is a mixture of 19-nor-stanols, in which the major resolved component has been fully characterized (as the acetate) as 19-nor-5α,-10β-ergost-trans-22-en-3β-ol (1). The remaining components (2)–(8) have been identified largely on the basis of spectral measurements.