Using O=C([O-])[O-], CCc1cc(C(=O)c2ccccc2Cl)cc(Br)c1O to produce CCc1cc(C(=O)c2ccccc2Cl)cc(Br)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.