Using Cn1c(=O)cc(-c2cccc(Cl)c2)c2cc(C(=O)c3ccc(Cl)s3)ccc21 to produce Cn1c(=O)cc(-c2cccc(Cl)c2)c2cc(C(O)c3ccc(Cl)s3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.