The molecule is a trisaccharide that is lactose in which the hydroxy group at position 6 of the galactosyl ring has been glycosylated by a beta-D-galactopyranosyl group. It is a trisaccharide, a D-glucoside and a beta-D-galactoside. It derives from a beta-(1->6)-galactobiose and a lactose.
(2R,3R,4S,5R,6R)-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