Using O=Cc1cc(Br)ccc1OC(F)(F)F, CC1(C)CC(=O)C(C)(C)O1 to produce CC1(C)OC(C)(C)C(=Cc2cc(Br)ccc2OC(F)(F)F)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.