Using CCCC(CCc1ccccc1OCc1ccccc1)(C(=O)OCC)C(=O)OCC to produce CCCC(CCc1ccccc1OCc1ccccc1)(C(=O)O)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.