Using Cc1cc(N)c2nc(C)n(-c3ccc(Cl)cc3Cl)c2n1, O=C(Cl)CCl to produce Cc1cc(NC(=O)CCl)c2nc(C)n(-c3ccc(Cl)cc3Cl)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.