Using O=C(O)CC(=O)O, COc1ccc(Cl)cc1C(=O)NCCc1ccc(C=O)cc1 to produce COc1ccc(Cl)cc1C(=O)NCCc1ccc(C=CC(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.