The molecule is a linear amino trisaccharide consisting of an alpha-sialyl residue linked (2->3) to an O-6-sulfated beta-D-galactosyl residue that in turn is linked (1->4) to an N-acetyl-beta-D-glucosaminyl residue at the reducing end. It has a role as an epitope. It is an amino trisaccharide, a glucosamine oligosaccharide and an oligosaccharide sulfate.
(2S,4S,5R,6R)-5-acetamido-2-[(2S,3R,4S,5S,6R)-2-[(2R,3S,4R,5R,6R)-5-acetamido-4,6-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3,5-dihydroxy-6-(sulfooxymethyl)oxan-4-yl]oxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid