Using O=C(c1cccc(C(=O)c2ccc(Br)c([N+](=O)[O-])c2)c1)c1ccc(Br)c([N+](=O)[O-])c1 to produce Nc1cccc(C(=O)c2cccc(C(=O)c3cccc(N)c3)c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.