?-D-GlcpNAc-(1->?)-?-D-Manp-(1->?)-?-D-GlcpNAc-(1->?)-?-D-Manp-(1->?)[?-D-GlcpNAc-(1->?)]-?-D-Manp-(1->?)-?-D-GlcpNAc-(1->?)-?-D-GlcNAc-(?->