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Structure of GD2 and OAcGD2 isomers identified in BC cells, with a 9-O-acetyl group (in red) either on the terminal or the subterminal sialic acid residue, resulting in Neu5,9Ac2α2-8Neu5Acα2-3[GalNAcβ1-4]LacCer or Neu5Acα2-8Neu5,9Ac2α2-3[GalNAcβ1-4]LacCer structures, respectively.
