Using COC(=O)C(=Cc1ccccc1)C(=O)C(=Cc1ccccc1)C(=O)OC to produce COC(=O)C(Cc1ccccc1)C(=O)C(Cc1ccccc1)C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.