?-D-Neup5Ac-(2->?)-?-D-GalpNAc-(1->?)-?-D-GlcpNAc-(1->?)[?-D-Neup5Ac-(2->?)-?-D-GalpNAc-(1->?)-?-D-GlcpNAc-(1->?)]-?-D-Manp-(1->
