Abstract
Abstract A novel oligoglycoside cucumarioside A 8 with unprecedented hydroxy group at C-18 was isolated from sea cucumber Eupentacta fraudatrix and its structure elucidated. The presence of hydroxy group at C-18 indicates that the glycoside is a “hot” metabolite that allows clarification of some peculiarities of 4,4,14-trimethylsterol glycoside biosynthetic pathways. A hypothetical scheme of biosynthesis of triterpene glycosides in sea cucumbers is proposed where direct formation of lanostane derivatives with a 7(8)-double bond from prosteroid cation is possible.
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