Using CCCCn1c(CC)cc(=O)c(C(=O)Nc2c(CC)cccc2CC)c1C, BrBr to produce CCCCn1c(C)c(C(=O)Nc2c(CC)cccc2CC)c(=O)c(Br)c1CC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.