The molecule is a linear amino trisaccharide comprising N-acetyl-alpha-neuraminic acid, beta-D-galactose and N-acetyl-6-O-sulfo-D-glucosamine residues linked sequentially (2->3) and (1->3). 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-[(2R,3R,4S,5S,6R)-2-[(3R,4R,5S,6R)-3-acetamido-2,5-dihydroxy-6-(sulfooxymethyl)oxan-4-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid