Using O=C1CCC(=O)N1Br, Cc1ccc([N+](=O)[O-])cc1C(F)(F)F to produce O=[N+]([O-])c1ccc(CBr)c(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.