The molecule is a trisaccharide consisting of D-galactopyranose, beta-D-galactopyranose and D-glucopyranose joined in sequence by (1->6) and (1->4) glycosidic bonds. It is a trisaccharide and a partially-defined glycan. It derives from a lactose.
(2R,3R,4S,5R)-2-(hydroxymethyl)-6-[[(2R,3R,4S,5R,6S)-3,4,5-trihydroxy-6-[(2R,3S,4R,5R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-2-yl]methoxy]oxane-3,4,5-triol