The molecule is a trisaccharide that is beta-D-galactopyranosyl-(1->2)-alpha-D-glucopyranoside in which the anomeric hydroxy group has been converted into the corresponding alpha-D-glucopyranosyl derivative.
(2S,3R,4S,5R,6R)-2-[(2R,3R,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol