Using CCOC(=O)COc1ccc(C(=O)c2ccccc2O)c(Cl)c1Cl to produce O=C(O)COc1ccc(C(=O)c2ccccc2O)c(Cl)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.