3-O-{poly[alpha-D-xylosyl-(1->3)-beta-D-glucuronosyl-(1->3)]-(1->4)-beta-D-xylosyl-(1->4)-(D-ribitylphospho)2-3-N-acetyl-beta-D-galactosaminyl-(1->3)-N-acetyl-beta-D-glucosaminyl-(1->4)-O-6-phospho-alpha-D-mannosyl}-L-threonine polyanion residue