beta-D-GlcpNAc-(1->4)-alpha-D-GlcpA-(1->3)-beta-D-GlcpNAc-(1->4)-alpha-D-GlcpA-(1->3)-beta-D-GlcpNAc-(1->4)-alpha-D-GlcpA-(1->3)-beta-D-GlcpNAc-(1->4)-alpha-D-GlcpA-(1->
