Using O=N[O-], CC(C)(C)OC(=O)N1CCCN(S(=O)(=O)c2cccc3cnccc23)CC1 to produce CC(C)(C)OC(=O)N1CCCN(S(=O)(=O)c2cccc3c([N+](=O)[O-])nccc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.