Using [N-]=[N+]=[N-], Nc1ccccc1N1C(=O)c2ccccc2C1=O to produce [N-]=[N+]=Nc1ccccc1N1C(=O)c2ccccc2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.