Using O=C(c1ccc(Cl)cc1)c1ccc(Cc2c(Cl)cc([N+](=O)[O-])cc2Cl)cc1 to produce Nc1cc(Cl)c(Cc2ccc(C(=O)c3ccc(Cl)cc3)cc2)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.