Using COC(=O)[O-], CCCCCCCCCCCCCCOc1ccc(C(C)=O)o1 to produce CCCCCCCCCCCCCCOc1ccc(C(=O)CC(=O)O)o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.