Using CN1CCN(C(=O)Oc2ccc(Cl)cc2)C1=C(C(=O)Oc1ccc(Cl)cc1)[N+](=O)[O-] to produce CN1CCNC1=C(C(=O)Oc1ccc(Cl)cc1)[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.