Using [N-]=[N+]=N[C@@H]1CCN(C(=O)OCc2ccc([N+](=O)[O-])cc2)C1 to produce N[C@@H]1CCN(C(=O)OCc2ccc([N+](=O)[O-])cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.