The molecule is a trisaccharide that is beta-D-galactopyranose in which the hydroxy groups at positions 2 and 3 have each been converted into the corresponding alpha-D-glucopyranosyl derivative. It derives from an alpha-D-Glcp-(1->2)-beta-D-Galp and an alpha-D-Glcp-(1->3)-beta-D-Galp.
(2R,3R,4S,5S,6R)-2-[(2R,3R,4S,5S,6R)-2,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-4-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol