The molecule is any branched trisaccharide consisting of D-galactopyranose having an L-fucosyl residue at the 2-position and a D-galactosyl residue at the 3-position.
(3S,4R,5S,6S)-2-[(3R,4S,5S,6R)-2,5-dihydroxy-6-(hydroxymethyl)-4-[(3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-3-yl]oxy-6-methyloxane-3,4,5-triol