alpha-D-Galp-(1->3)-beta-D-Galp-(1->4)-D-GlcpNAc-yl group
alpha-d-galp-(1->3)-beta-d-galp-(1->4)-d-glcpnac-yl group
An <em>N</em>-acetyl-<small>D</small>-glucosaminyl group comprising one <em>N</em>-acetylated glucosamine and two galactose residues, linked as shown. A trisaccharide antigen found in all animals apart from Old World primates and humans, it is the main xenoantigen hampering the success of clinical xenotransplantation. Obtained formally by removing the hydroxy group from the hemiacetal function of the amino trisaccharide α-<small>D</small>-galactosyl-(1→3)-β-<small>D</small>-galactosyl-(1→4)-<em>N</em>-acetyl-<small>D</small>-glucosamine.