Using CN1C(=O)CNC(c2ccccc2)c2cc(Cl)ccc21, O=C(Cl)CCl to produce CN1C(=O)CN(C(=O)CCl)C(c2ccccc2)c2cc(Cl)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.