alpha-D-GlcpN2,6S2-(1->4)-[4)-alpha-L-IdopA2S-(1->4)-alpha-D-GlcpN2,6S2-(1->]n-alpha-L-IdopA2S-(1->4)-alpha-D-GlcpNAc6S-(1->4)-[4)-alpha-D-GlcpA-(1->4)-alpha-D-GlcpN2S-(1->]n-[4)-alpha-D-GlcpA-(1->4)-alpha-D-GlcpNAc-(1->]n-alpha-L-IdopA2S(1->