The molecule is a galactotriose consisting of two alpha-D-galactopyrase residues and a D-galactopyranose residue joined in sequence by (1->3) and (1->4) glycosidic bonds.
(2R,3R,4S,5R,6R)-2-[(2R,3S,4S,5R,6R)-3,5-dihydroxy-2-(hydroxymethyl)-6-[(2R,3R,4R,5R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-4-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol