The molecule is a trisaccharide that is alpha-L-arabinopyranose which has been glycosylated at positions 2 and 3 by alpha-L-arabinopyranosyl and beta-D-glucopyrnaosyl groups, respectively. It derives from a 3-O-beta-D-Glcp-(1->3)-alpha-L-Arap.
(2S,3R,4S,5S,6R)-2-[(2R,3R,4S,5S)-2,5-dihydroxy-3-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-4-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol