beta-D-GlcpA-(1->3)-beta-D-GlcpNAc-(1->4)-beta-D-GlcpA-(1->3)-beta-D-GlcpNAc-(1->4)-beta-D-GlcpA-(1->3)-beta-D-GlcpNAc-(1->4)-beta-D-GlcpA-(1->3)-?-D-Glc?NAc-(1->
