Marine steroids. Part I. Structures of the principal aglycones from the saponins of the starfish, Marthasterias glacialis

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Abstract
The principal aglycones obtained by hydrolysis of the saponins of M. glacialis are identified as 3β,6α-dihydroxy-5α-cholesta-9(11),24-dien-23-one and 3β,6α-dihydroxy-5α-cholest-9(11)-en-23-one. These are the first 23-oxo-cholestanes to be isolated from natural sources. On catalytic hydrogenation they yield 3β,6α-dihydroxy-5α-cholestan-23-one, which has been synthesised from stigmasterol.