Using CC(=O)c1cn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)nc1C#N, FC(F)(Br)Br to produce CC(=C(F)F)c1cn(-c2c(Cl)cc(C(F)(F)F)cc2Cl)nc1C#N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.