Using CCOC(=O)C(OC(C)(C)C)c1c(C)cc2ccccc2c1O, BrBr to produce CCOC(=O)C(OC(C)(C)C)c1c(C)c(Br)c2ccccc2c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.