Using O=C([O-])[O-], O=[N+]([O-])c1cc(Br)c(CBr)c(Br)c1 to produce O=[N+]([O-])c1cc(Br)c(CO)c(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.