?-D-GlcpNAc-(1->?)-?-D-GlcpA-(1->?)[?-D-GlcpNAc-(1->?)]-?-D-GlcpA-(1->?)[?-D-GlcpNAc-(1->?)]-?-D-GlcpA-(1->?)-?-D-Galp(1->