?-D-GlcpNAc-(1->?)[?-D-Neup5Ac-(2->?)]-?-D-Galp-(1->?)-?-D-GlcpNAc-(1->?)[?-D-Neup5Ac-(2->?)]-?-D-Galp-(1->?)-?-D-GlcpNAc-(1->?)[?-D-Neup5Ac-(2->?)]-?-D-GalNAc
