Using [N-]=[N+]=[N-], COc1ccc(C(Br)c2cccc([N+](=O)[O-])c2)cc1 to produce COc1ccc(C(N=[N+]=[N-])c2cccc([N+](=O)[O-])c2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.