Using O=C(Cn1ccnc1)N1CCCc2ccc([N+](=O)[O-])cc21 to produce O=[N+]([O-])c1ccc2c(c1)N(CCn1ccnc1)CCC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.