Using O=P(Br)(Br)Br, Cc1ccc(N2C(=O)c3ccccc3C2=O)[n+]([O-])c1 to produce Cc1ccc(N2C(=O)c3ccccc3C2=O)nc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.