Abstract
The structure of forbeside E, a minor constituent of the saponin fraction of the starfish Asteriasforbesi, has been identified as the disodium salt of (20R)-5α-pregn-9(11)ene-3β-sulfo-oxy-6α-[O-β-D-4-sulfo-oxyquinovopyranosyl]-20-ol, principally by 2D-COSY, DQ COSY, HCORR, and DEPT experiments. Sodium thornasterol-3-O-sulfate has been isolated as a natural product from the same organism. Keywords: sulfated sterol glycoside, Asteriasforbesi metabolites, sodium thomasterol-3-O-sulfate, asterogenol rearrangement.
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