Using O=C([O-])[O-], CCc1sc(-c2ccc(Cl)cc2)nc1C1C(=O)CCC1=O to produce CCc1sc(-c2ccc(Cl)cc2)nc1C1=C(OC)CCC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.