[[4)-beta-D-Xylp-(1->4)-[alpha-D-GlcpA4Me-(1->2)-beta-D-Xylp-(1->4)]-[4)-beta-D-Xylp-(1->]-beta-D-Xylp-(1->4)-alpha-D-GlcpA-(1->2)-beta-D-Xylp-(1->4)]-beta-D-Xylp-(1->]