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