The molecule is a trisaccharide consisting of two beta-D-galactopyranose residues and a D-xylopyranose residue joined in sequence by (1->3) and (1->4) glycosidic bonds. It derives from a beta-(1->3)-galactobiose and a beta-D-Galp-(1->4)-D-Xylp.
(2S,3R,4S,5R,6R)-2-[(2R,3S,4S,5R,6S)-3,5-dihydroxy-2-(hydroxymethyl)-6-[(3R,4R,5R)-4,5,6-trihydroxyoxan-3-yl]oxyoxan-4-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol