Using COC(=O)Cc1ccc(Br)cc1, CC(=O)c1ccc(OC(F)(F)F)cc1 to produce O=C(CC(=O)c1ccc(OC(F)(F)F)cc1)Cc1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.