Using O=N[O-], COc1ccc(Cn2c(N)cc(=O)[nH]c2=O)cc1OC1CCCC1 to produce COc1ccc(Cn2c(N)c(N=O)c(=O)[nH]c2=O)cc1OC1CCCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.