Using COC(=O)c1ccc2cc(NCc3nc(-c4ccccc4Cl)cs3)ccc2c1 to produce O=C(O)c1ccc2cc(NCc3nc(-c4ccccc4Cl)cs3)ccc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.