Using FC(F)(F)c1ccc(-c2ccc(Br)cc2)cc1, O=CCCC(F)(F)F to produce OC(CCC(F)(F)F)c1ccc(-c2ccc(C(F)(F)F)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.