Using Cn1cc(C(=O)CCl)cc1C(=O)c1ccc(Cl)cc1, O=C[N-]C=O to produce Cn1cc(C(=O)CN(C=O)C=O)cc1C(=O)c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.