Using O=Cc1ccc(F)c(Br)c1, Fc1cc(Br)cc(OC(F)(F)C(F)F)c1 to produce OC(c1ccc(F)c(Br)c1)c1ccc(F)cc1OC(F)(F)C(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.