Using Br, CC(C)(C)OC(=O)NC1(c2ccc(C(=O)Cc3ccccc3)cc2)CCC1 to produce CC(C)(C)OC(=O)NC1(c2ccc(C(=O)C(Br)c3ccccc3)cc2)CCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.