[4)-beta-D-GlcpA-(1->4)-beta-D-GlcpA2Ac-(1->4)-beta-D-Glcp-(1->4)[beta-D-Galp-(1->3)-beta-D-Glcp-(1->4)-beta-D-Glcp-(1->4)-beta-D-Glcp-(1->6)]-alpha-D-Glcp2Ac-(1->]n