Using O=C([O-])[O-], CCC(=O)C1=C(O)C(=O)N(Cc2ccc(OC)cc2)CC1 to produce CCC(=O)C1=C(OC)C(=O)N(Cc2ccc(OC)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.