Using Cc1c(C(=O)c2ccccc2)c(=O)n(C)c(=O)n1C, BrBr to produce Cn1c(CBr)c(C(=O)c2ccccc2)c(=O)n(C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.