?-D-GlcpA-(1→?)-?-D-GlcpNAc-(1→?)-?-D-GlcpA-(1→?)-?-D-GlcpNAc-(1→?)-?-D-GlcpA-(1→?)-?-D-GlcpNAc-(1→?)-?-D-GlcpA-(1→?)-?-D-Glc?NAc-(1→
