Using Fc1cc(Br)c(F)cc1Cl, CC(C)OB1OC(C)(C)C(C)(C)O1 to produce CC1(C)OB(c2cc(F)c(Cl)cc2F)OC1(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.