Using Nc1ccc(NC(=O)c2ccccc2)c2c1C(=O)c1ccccc1C2=O, BrBr to produce Nc1c(Br)cc(NC(=O)c2ccccc2)c2c1C(=O)c1ccccc1C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.