alpha-L-GlcpN2,6S23,4Ac2-(1->4)-alpha-L-IdopA2S3Ac-(1->4)-[4)-alpha-L-GlcpN2,6S23Ac-(1->4)-alpha-L-IdopA2S3Ac-(1->]-alpha-L-GlcpN2,6S23Ac(1->