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