Using O=C([O-])/C=C/c1ccccc1, COC(=O)C(=O)c1ccccc1CBr to produce COC(=O)C(=O)c1ccccc1CC(=O)C=Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.