The molecule is a disaccharide consisting of beta-D-galactopyranose having a D-galactopyranosyl residue attached at the 6-position via an alpha-linkage. alpha-D-Gal-(1->6)-D-Gal in which the configuration at the reducing end anomeric centre is beta.
(2R,3R,4S,5R,6R)-6-[[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxane-2,3,4,5-tetrol