O-[N-acetyl-alpha-neuraminyl-(2->6)-N-acetyl-alpha-D-galactosaminyl]-serine
o-[n-acetyl-alpha-neuraminyl-(2->6)-n-acetyl-alpha-d-galactosaminyl]-serine
A non-proteinogenic α-amino acid that is <em>N</em>-acetyl-α-neuraminyl-(2→6)-<em>N</em>-acetyl-α-<small>D</small>-galactosamine linked via an α glycosidic bond to the <em>O</em> at position 3 of serine.