O(3)-{beta-D-galactosyl-(1->3)-[N-acetyl-alpha-neuraminosyl-(2->6)]-N-acetyl-alpha-D-galactosaminyl}-L-serine(1-) residue
o(3)-{beta-d-galactosyl-(1->3)-[n-acetyl-alpha-neuraminosyl-(2->6)]-n-acetyl-alpha-d-galactosaminyl}-l-serine(1-) residue
An <small>L</small>-α amino acid residue obtained by deprotonation of the carboxy group of <em>O</em><small><sup>3</small></sup>-{β-<small>D</small>-galactosyl-(1→3)-[<em>N</em>-acetyl-α-neuraminosyl-(2→6)]-<em>N</em>-acetyl-α-<small>D</small>-galactosaminyl}-<small>L</small>-serine residue; major species at pH 7.3.