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