Using CS(=O)(=O)Nc1cccc2c(O)c(N)ccc12, O=C(Cl)CCl to produce CS(=O)(=O)Nc1cccc2c(O)c(NC(=O)CCl)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.