The molecule is a branched amino tetrasaccharide consisting of a linear sequence of alpha-neuraminyl, beta-D-galactosyl and N-acetyl-D-galactosamine residues linked (2->3) and (1->6), to the N-acetyl-D-galactosamine residue of which is also linked (2->6) another alpha-neuraminyl residue. It has a role as an epitope. It is an amino tetrasaccharide and a galactosamine oligosaccharide.
(2R,4S,5R,6R)-5-acetamido-2-[[(2R,3R,4R,5R)-5-acetamido-4-[(2R,3R,4S,5S,6R)-4-[(2S,4S,5R,6R)-5-acetamido-2-carboxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,6-dihydroxyoxan-2-yl]methoxy]-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid