Marine sterols. XII. Glaucasterol, a novel C27 sterol with a unique side chain, from the soft coral Sarcophyton glaucum

Article abstract of DOI:10.1016/0039-128X(82)90007-1

A minor C₂₇ sterol, glaucasterol, was isolated from the soft coral Sarcophyton glaucum. Based on the spectroscopic evidence and the correlation to cholestanol and 26-nor-27-homocholestanol, its structure was proposed to be 24ξ,25ξ-24,26-cyclocholesta-5,22E-dien-3β-ol (1), the first example of a natural C₂₇ sterol having a cyclopropane ring in the side chain.