The molecule is an amino disaccharide comprised of an N-acetyl-alpha-neuraminyl residue linked (2->3) to N-acetyl-alpha-D-galactosamine It has a role as an epitope.
(2S,4S,5R,6R)-5-acetamido-2-[(2S,3R,4R,5R,6R)-3-acetamido-2,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid