beta-D-GlcpNAc6Gc-(1->4)-beta-D-GlcpNAc6Gc-(1->4)-beta-D-GlcpNAc6Gc-(1->4)-beta-D-GlcpNAc6Gc-(1->4)-beta-D-GlcpNAc6Gc-(1->4)-?-D-GlcpNAc6Gc(1->