Using COC(=O)c1cc(-c2ccccc2)c(Br)c2cc(C(C)(C)C)oc12 to produce CC(C)(C)c1cc2c(Br)c(-c3ccccc3)cc(C(=O)O)c2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.