Using CC(C)(C)OC(=O)N[C@H]1CC[C@H](N)CC1, O=C1OC(=O)c2c1cccc2[N+](=O)[O-] to produce CC(C)(C)OC(=O)N[C@H]1CC[C@H](N2C(=O)c3cccc([N+](=O)[O-])c3C2=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.