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