The molecule is a linear amino trisaccharide comprising alpha-neuraminyl, N-acetyl-beta-D-galactosaminyl and N-acetyl-beta-D-glucosamine residues linked sequentially (2->6) and (1->4). It has a role as an epitope. It is a glucosamine oligosaccharide, a galactosamine oligosaccharide and an amino trisaccharide.
(2R,4S,5R,6R)-5-acetamido-2-[[(2R,3R,4R,5R,6S)-5-acetamido-6-[(2R,3S,4R,5R,6R)-5-acetamido-4,6-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3,4-dihydroxyoxan-2-yl]methoxy]-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid