Using CN1CCNCC1, O=C1CCN(c2ccc([N+](=O)[O-])cc2)CC1 to produce CN1CCN(C2CCN(c3ccc([N+](=O)[O-])cc3)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.