Using COC(=O)C(CCc1ccccc1)C(CC(=O)OC(C)(C)C)C(=O)OCc1ccccc1 to produce COC(=O)C(CCc1ccccc1)C(CC(=O)OC(C)(C)C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.