Using O=C(CC(=O)C(F)(F)F)c1cn(-c2ccc(Br)cc2Cl)c(-c2ccccc2Cl)n1, NO to produce FC(F)(F)c1cc(-c2cn(-c3ccc(Br)cc3Cl)c(-c3ccccc3Cl)n2)no1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.