Using O=P(Br)(Br)Br, O=[N+]([O-])c1cc[n+]([O-])c2ccccc12 to produce O=[N+]([O-])c1cc(Br)nc2ccccc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.