Abstract
A C27-sterol with a unique side-chain was isolated from a starfish, Leiaster leachii. The sterol was isolated from the complex sterol mixture of the starfish by using column chromatography on silver nitrate-impregnated silicic acid with hexane-benzene. The structure of this sterol was elucidated by gas-liquid chromatography, infrared absorption, mass, and nuclear magnetic resonance spectrometry. As a result, this sterol was identical with amuresterol, 22-trans-27-nor-(24S)-24-methylcholesta-7, 22-dien-3β-ol, a new sterol which had been quite recently isolated from another species of starfish, Asterias amurensis.
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