[beta-D-Xylp-(1->4)-beta-D-Xylp-(1->4)-[beta-D-Xylp-(1->4)-[beta-D-Xylp-(1->4)-[beta-D-Xylp-(1->2)-alpha-L-Manp-(1->3)]-[beta-D-Xylp-(1->2)-alpha-L-Manp-(1->3)]]-beta-D-GlcpA-(1->2)-?-L-Manp(1-]]-