The molecule is an amino trisaccharide consisting of N-acetyl-beta-D-galactosaminyl and 5-glycoloyl-alpha-neuraminyl residues linked respectively (1->4) and (2->3) to beta-D-galactose. It has a role as an epitope.
(2S,4S,5R,6R)-5-acetamido-2-[(2R,3R,4R,5S,6R)-5-[(2S,3R,4R,5R,6R)-3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-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