Using [O-][Cl+][O-], O=CC1=C(Cl)c2ccccc2OC1c1ccccc1 to produce O=C(O)C1=C(Cl)c2ccccc2OC1c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.