Using BrC(Br)(Br)Br, CC(C)(C)OC(=O)N1c2ccc(-c3ccccc3)cc2C(CO)=CC1(C)C to produce CC(C)(C)OC(=O)N1c2ccc(-c3ccccc3)cc2C(CBr)=CC1(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.