Using [Br-], COc1cccc(OC)c1-c1ccc2c(c1)C(C)(C)CCC2(C)C to produce COc1ccc(Br)c(OC)c1-c1ccc2c(c1)C(C)(C)CCC2(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.