Using CN1CCN(c2ccc(C(=O)NCCCCCCCCCCCCO)cn2)CC1, O=[N+]([O-])O to produce CN1CCN(c2ccc(C(=O)NCCCCCCCCCCCCO[N+](=O)[O-])cn2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.