Using CC1(C)C(=O)N(Br)C(=O)N1Br, O=C(c1cccc(C(F)(F)F)c1)C(F)(F)F to produce O=C(c1cc(Br)cc(C(F)(F)F)c1)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.