Using CCCC(CC(=O)c1ccc(Br)cc1)(C(=O)[O-])C(=O)[O-], CC(C)=O to produce CCCC(CC(=O)c1ccc(Br)cc1)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.