Using CC(C)(C)c1c(F)cc(O)cc1F, CC(C)(C)OC(=O)CBr to produce CC(C)(C)OC(=O)COc1cc(F)c(C(C)(C)C)c(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.