Using CC(C)(C)OC(=O)CC1(CC(=O)OC(C)(C)C)C(=O)Nc2ccccc21, BrCc1ccccc1 to produce CC(C)(C)OC(=O)CC1(CC(=O)OC(C)(C)C)C(=O)N(Cc2ccccc2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.