O(3)-(beta-D-glucuronosyl-(1->3)-beta-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-beta-D-2-O-phospho-xylosyl)-L-serine(3-) residue
o(3)-(beta-d-glucuronosyl-(1->3)-beta-d-galactosyl-(1->3)-beta-d-galactosyl-(1->4)-beta-d-2-o-phospho-xylosyl)-l-serine(3-) residue