Pseudostichoposide B – new triterpene glycoside with unprecedent type of sulfatation from the deep-water North-Pacific sea cucumber pseudostichopus trachus

Abstract

New triterpene disulfated tetraoside, pseudostichoposide B (1) has been isolated from the sea cucumber Pseudostichopus trachus. The structure of this glycoside has been deduced by the extensive analysis of NMR and mass-spectra and chemical evidence. Except for a common sulfate group at C-4 of the first xylose residue, pseudostichoposide B contains an additional sulfate group at C-3 of quinovose residue in the carbohydrate chain, not earlier found in sea cucumber glycosides.