Using O=[N+]([O-])c1cc(Cl)c(Cl)cc1Cl, CC(C)(C)OC(=O)CCl to produce CC(C)(C)OC(=O)Cc1c(Cl)c(Cl)cc(Cl)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.