Using Cc1nc(CBr)co1, O=[N+]([O-])c1cccc2[nH]nc(Br)c12 to produce Cc1nc(Cn2nc(Br)c3c([N+](=O)[O-])cccc32)co1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.