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