The molecule is a galactotriose consisting of two alpha-D-galactopyranose residues and a beta-D-galactopyranose residue joined in sequence by (1->6) and (1->3) glycosidic bonds. It derives from an alpha-D-Galp-(1->3)-beta-D-Galp.
(2R,3R,4S,5S,6R)-6-(hydroxymethyl)-4-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxyoxane-2,3,5-triol