Using O=C([O-])c1ccccc1C(=O)O[O-], Cn1cc(-c2cncc(Br)c2)cn1 to produce Cn1cc(-c2cc(Br)c[n+]([O-])c2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.