Using CCOC(=O)C(C(C)=O)C(c1ccc(OC)cc1)C(C(C)=O)C(=O)[O-] to produce COc1ccc(C(CC(=O)O)CC(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.