Using O=N[O-], COc1ccc(Cn2c(=O)cc(N)n(C)c2=O)cc1 to produce COc1ccc(Cn2c(=O)c(N=O)c(N)n(C)c2=O)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.