Using O=C1Cc2c(Cl)ncnc2N1, O=[N+]([O-])c1ccc(CBr)c(CBr)c1 to produce O=C1Nc2ncnc(Cl)c2C12Cc1ccc([N+](=O)[O-])cc1C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.