O(3)-(beta-D-galactosyl-(1->4)-beta-D-xylosyl)-L-serine residue
o(3)-(beta-d-galactosyl-(1->4)-beta-d-xylosyl)-l-serine residue
An <small>L</small>-α-amino acid residue derived from <em>O</em><small><sup>3</small></sup>-(β-<small>D</small>-galactosyl-(1→4)-β-<small>D</small>-xylosyl)-<small>L</small>-serine.