The molecule is an amino tetrasaccharide comprising an alpha-N-acetylneuraminyl residue (2->3)-linked to a beta-D-galactopyranosyl residue which is itself linked at position 4 to a beta-D-galactopyranosyl-(1->3)-2-(acetylamino)-2-deoxy-beta-D-galactopyranosyl group. It is a galactosamine oligosaccharide and an amino tetrasaccharide.
(2S,4S,5R,6R)-5-acetamido-2-[(2R,3R,4R,5S,6R)-5-[(2S,3R,4R,5R,6R)-3-acetamido-5-hydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-2,3-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid