alpha-Neup5Ac-(2->4)-beta-D-GlcpNAc-(1->4)-[alpha-L-Fucp-(1->3)]-beta-D-GlcpNAc
alpha-neup5ac-(2->4)-beta-d-glcpnac-(1->4)-[alpha-l-fucp-(1->3)]-beta-d-glcpnac
A branched amino tetrasaccharide comprised of <em>N</em>-acetyl-α-neuraminyl, <em>N</em>-acetyl-β-<small>D</small>-glucosaminyl and (at the reducing end) <em>N</em>-acetyl-β-<small>D</small>-glucosamine residues all linked sequentially (1→4), with the reducing-end <em>N</em>-acetyl-β-<small>D</small>-glucosamine residue carrying also an <small>L</small>-fucosyl residue via a (1→3) linkage.