Using CC1(C)OC(=O)C(CCn2cccc2C(=O)c2ccccc2)C(=O)O1 to produce CC1(C)OC(=O)C(Br)(CCn2cccc2C(=O)c2ccccc2)C(=O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.