?-D-GalpNAc-(1->?)-?-D-Galp-(1->?)-?-D-GlcpNAc-(1->?)[?-D-Galp-(1->?)[?-D-NeupAc-(2->?)]-?-D-GlcpNAc-(1->?)]-?-D-Galp-(1->?)-?-D-GlcpNAc-(1->?)[?-D-NeupAc-(2->?)]-?-D-GalpNAc(1->