[4)-alpha-D-GlcpN2S-(1->4)-alpha-L-IdopA-(1->4)-alpha-D-GlcpNAc-(1->4)-alpha-D-GlcpA-(1->4)-alpha-D-GlcpN2,3S2-(1->4)-alpha-L-IdopA2S-(1->4)-alpha-D-GlcpN2S-(1->4)-alpha-L-IdopA2S-(1->]n