has role ->8)-alpha-Neu5Ac-(2->3)-[beta-D-Gal-(1->3)-beta-D-GalNAc-(1->4)]-beta-D-Gal-(1->4)-yl group R'-alpha-Neu5Ac-(2->3)-[beta-D-Gal-(1->3)-beta-D-GalNAc-(1->4)]-beta-D-Gal-(1->4)-R" PMID:7691279 An organic group forming part of, and a proposed epitope within, ganglioside GM1. The ->8) linkage to Neu5Ac may represent an additional alpha2->8-linked sialic acid residue, while the -(1->4)-yl may represent -(1->4)-glucosyl. CHEBI:142514 chebi_ontology ->8)-5-acetamido-3,5-dideoxy-D-glycero-alpha-D-galacto-non-2-ulosyl-(2->3)-[beta-D-galactosyl-(1->3)-N-acetyl-beta-D-galactosyl-(1->4)]-beta-D-galactosyl-(1->4)-yl Galbeta1-3GalNAcbeta1-4(R'-NeuAcalpha2-3)Galbeta1-4-R" organic group epitope