The molecule is a linear tetrasaccharide comprising three successive D-galactosyl residues and a glucosyl residue at the reducing end joined by sequential alpha-(1->4)-, beta-(1->3)- and beta-(1->4)-linkages.
(2R,3R,4S,5R,6R)-2-[(2R,3R,4R,5R,6S)-6-[(2R,3S,4S,5R,6S)-3,5-dihydroxy-2-(hydroxymethyl)-6-[(2R,3S,4R,5R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-4-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol