The molecule is a branched amino pentasaccharide comprising a linear chain of alpha-sialyl, beta-D-galactosyl, N-acetyl-beta-D-glucosaminyl and N-acetyl-alpha-D-galactosaminyl residues, linked (2->3), (1->4) and (1->3) respectively, with an alpha-L-fucosyl residue linked to the N-acetyl-beta-D-glucosaminyl residue. It derives from an alpha-L-Fucp-(1->3)-[beta-D-Galp(1->4)]-beta-D-GlcpNAc-(1->3)-alpha-D-GalpNAc.
(2S,4S,5R,6R)-5-acetamido-2-[(2S,3R,4S,5S,6R)-2-[(2R,3S,4R,5R,6R)-5-acetamido-6-[(2S,3R,4R,5R,6R)-3-acetamido-2,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-2-(hydroxymethyl)-4-[(2S,3S,4R,5S,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-3-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid