Using Nc1cc(-c2ccccn2)n[nH]1, O=CC(C=O)[N+](=O)[O-] to produce O=[N+]([O-])c1cnc2[nH]nc(-c3ccccn3)c2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.