Using COC(=O)c1cc(Br)c(NC(=O)C(F)(F)F)c([N+](=O)[O-])c1 to produce CNc1c(Br)cc(C(=O)OC)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.