O(4)-(N-acetyl-alpha-D-galactosaminyl)-trans-4-hydroxy-L-proline residue
o(4)-(n-acetyl-alpha-d-galactosaminyl)-trans-4-hydroxy-l-proline residue
An <small>L</small>-α-amino acid residue derived from <em>O</em><small><sup>4</small></sup>-(<em>N</em>-acetyl-α-<small>D</small>-galactosaminyl)-<i>trans</i>-4-hydroxy-<small>L</small>-proline.