Using CCOC(=O)C(CC(=O)c1ccc2cc(OC)ccc2c1)C(=O)c1ccccc1 to produce COc1ccc2cc(C(=O)CCC(=O)c3ccccc3)ccc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.