The molecule is an amino disaccharide consisting of D-galactose having an alpha-N-acetylneuraminyl residue attached at the 3-position It has a role as an epitope.
(2S,4S,5R,6R)-5-acetamido-4-hydroxy-2-[(3R,4S,5S,6R)-2,3,5-trihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid