Using COC(=O)c1nc(Br)cc(Br)c1OC, [N-]=[N+]=[N-] to produce COC(=O)c1nc(Br)cc(N=[N+]=[N-])c1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.