The molecule is a branched amino tetrasaccharide comprising alpha-N-glycoloylneuraminyl, beta-D-galactosyl and N-acetyl-beta-D-glucosamine residues linked sequentially (2->3) and (1->3), to the galactosyl residue of which is also linked (1->4) an alpha-L-fucosyl residue. It has a role as an epitope. It is a glucosamine oligosaccharide and an amino tetrasaccharide.
(2S,4S,5R,6R)-2-[(2R,3R,4S,5S,6R)-2-[(2R,3R,4R,5S,6R)-3-acetamido-2-hydroxy-6-(hydroxymethyl)-5-[(2S,3S,4R,5S,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-4-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-4-hydroxy-5-[(2-hydroxyacetyl)amino]-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid