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