Using COC(=O)CS(=O)(=O)c1ccc2[nH]c(-c3ccc(Cl)s3)nc2c1 to produce O=C(O)CS(=O)(=O)c1ccc2[nH]c(-c3ccc(Cl)s3)nc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.