Using BrCc1ccc(Br)cc1, CCOC(=O)CC(C)=O to produce CCOC(=O)C(Cc1ccc(Br)cc1)(Cc1ccc(Br)cc1)C(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.