?-D-GlcpNAc-(1->?)-?-D-GlcpA-(1->?)-?-D-GlcpNAc-(1->?)-?-D-GlcpA-(1->?)-?-D-GlcpNAc-(1->?)-?-D-GlcpA-(1->?)-?-D-GlcpNAc-(1->?)-?-D-GlcpA-(1->?)-?-D-GlcpNAc-(1->?)-?-D-GlcpA-(1->?)-?-D-GlcpNAc(1->