The molecule is a trisaccharide consisting of 2 alpha-D-glucopyranose residues and a D-galactopyranose residue joined in sequence by (1->2) and (1->3) residues. It derives from an alpha-D-Glcp-(1->2)-alpha-D-Glcp.
(3R,4S,5S,6R)-4-[(2R,3R,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-(hydroxymethyl)oxane-2,3,5-triol