Using CC1(C)C(C=C(Cl)c2ccc(Cl)cc2)C1C(=O)O, Fc1c(F)c(F)c(CBr)c(F)c1F to produce CC1(C)C(C=C(Cl)c2ccc(Cl)cc2)C1C(=O)OCc1c(F)c(F)c(F)c(F)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.