Using CC(C)(C)OC(=O)N1Cc2ccc(C=O)cc2C1, FC(F)(Br)Br to produce CC(C)(C)OC(=O)N1Cc2ccc(C=C(F)F)cc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.