Using O=[N+]([O-])O, CN1CCN(c2ncccc2C(=O)NCCO)CC1 to produce CN1CCN(c2ncccc2C(=O)NCCO[N+](=O)[O-])CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.