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