Using On1nnc2ccccc21, O=C(O)Cc1cc(C(=O)c2ccc(Cl)cc2)sc1-c1ccccc1 to produce O=C(Cc1cc(C(=O)c2ccc(Cl)cc2)sc1-c1ccccc1)NO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.