[[4)-beta-D-Xylp-(1->4)-beta-D-Xylp-(1->4)-beta-D-Xylp-(1->4)-alpha-D-GlcpA4(%)Me-(1->2)-beta-D-Xylp-(1->4)]-beta-D-Xylp-(1->4)-beta-D-Xylp-(1->4)-beta-D-Xylp-(1->]