Using CC(C)(C)OC(=O)C(Cc1cccc2ccccc12)C(=O)OC(C)(C)C, BrCc1ccccc1 to produce CC(C)(C)OC(=O)C(Cc1ccccc1)(Cc1cccc2ccccc12)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.