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