O(3)-{N-acetyl-beta-D-glucosaminyl-(1->3)-beta-D-galactosyl-(1->3)-N-acetyl-alpha-D-galactosaminyl}-L-serine residue
o(3)-{n-acetyl-beta-d-glucosaminyl-(1->3)-beta-d-galactosyl-(1->3)-n-acetyl-alpha-d-galactosaminyl}-l-serine residue
An <small>L</small>-α-amino acid residue derived from <em>O</em><small><sup>3</small></sup>-{<em>N</em>-acetyl-β-<small>D</small>-glucosaminyl-(1→3)-β-<small>D</small>-galactosyl-(1→3)-<em>N</em>-acetyl-α-<small>D</small>-galactosaminyl}-<small>L</small>-serine residue.