Using COCc1ncc(C(=O)OC)n1Cc1cc(-c2ccc(Cl)s2)on1 to produce COCc1ncc(C(=O)O)n1Cc1cc(-c2ccc(Cl)s2)on1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.