3-O-{[N-acetyl-alpha-neuraminosyl-(2->3)]-N-acetyl-beta-D-galactosaminyl-(1->4)-beta-D-galactosyl-(1->3)-[N-acetyl-alpha-neuraminosyl-(2->6)]-N-acetyl-alpha-D-galactosaminyl}-L-threonine(2-) residue
3-o-{[n-acetyl-alpha-neuraminosyl-(2->3)]-n-acetyl-beta-d-galactosaminyl-(1->4)-beta-d-galactosyl-(1->3)-[n-acetyl-alpha-neuraminosyl-(2->6)]-n-acetyl-alpha-d-galactosaminyl}-l-threonine(2-) residue
An <small>L</small>-α amino acid residue obtained by deprotonation of the carboxy groups of 3-<em>O</em>-{[<em>N</em>-acetyl-α-neuraminosyl-(2→3)]-<em>N</em>-acetyl-β-<small>D</small>-galactosaminyl-(1→4)-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>-threonine residue; major species at pH 7.3.