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