Using O=[N+]([O-])c1cc(F)c(Br)cc1F, NCC(=O)[O-] to produce O=C([O-])CNc1cc(Br)c(F)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.