alpha-D-Neup5Ac-(2->?)-?-D-Galp-(1->?)-beta-D-GlcpNAc-(1->3)[alpha-D-Neup5Ac-(2->?)-?-D-Galp-(1->?)-beta-D-GlcpNAc-(1->6)]-alpha-D-GalpNAc-(1->
