Using O=C(O)CC(c1ccc(F)cc1)c1ccc(C(F)(F)F)cc1Br to produce O=C1CC(c2ccc(F)cc2)c2ccc(C(F)(F)F)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.