alpha-D-GlcpA4(%)Me-(1->2)[[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)-alpha-L-Arap-(1->3)-beta-D-Xylp-(1->4)-beta-D-Xylp-(1->]n