The molecule is a tetrasaccharide comprising residues of galactose, N-acetylglucosamine, galactose and N-acetylglucosamine units in a linear sequence, joined sequentially via beta(1->3), beta(1->3), and beta(1->4) linkages. beta-D-Gal-(1->3)-beta-D-GlcNAc-(1->3)-beta-D-Gal-(1->4)-D-GlcNAc with beta-configuration at the anomeric centre of the reducing-end N-acetylglucosamine residue. It has a role as an epitope.
N-[(2R,3R,4R,5S,6R)-5-[(2S,3R,4S,5S,6R)-4-[(2S,3R,4R,5S,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-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2,4-dihydroxy-6-(hydroxymethyl)oxan-3-yl]acetamide