N-acetyl-alpha-neuraminosyl-(2->3)-beta-D-galactosyl-(1->3)-N-acetyl-alpha-D-galactosaminyl-(1<->1')-L-serine(1-) residue
n-acetyl-alpha-neuraminosyl-(2->3)-beta-d-galactosyl-(1->3)-n-acetyl-alpha-d-galactosaminyl-(1<->1')-l-serine(1-) residue