Using [O-][Cl+][O-], CC(C)(C)OC(=O)COc1ccc2nc(Cl)c(C=O)cc2c1 to produce CC(C)(C)OC(=O)COc1ccc2nc(Cl)c(C(=O)O)cc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.