Using CNc1c(OC)cc(Cc2cnc(N)nc2N)cc1OC, O=N[O-] to produce COc1cc(Cc2cnc(N)nc2N)cc(OC)c1N(C)N=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.