Using BrBr, CCC(CC)Nc1cccc2c1C(=O)c1ccccc1C2=O to produce CCC(CC)Nc1ccc(Br)c2c1C(=O)c1ccccc1C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.