Using [N-]=[N+]=[N-], COc1ccccc1NC(=O)Nc1ccc(N)cc1O to produce COc1ccccc1NC(=O)Nc1ccc(N=[N+]=[N-])cc1O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.