Using COC(=O)CCc1ccc(O)c(Cl)c1O, O=C1OC(=O)c2c(Cl)cccc21 to produce COC(=O)CCc1cc(C(=O)c2cccc(Cl)c2C(=O)O)c(O)c(Cl)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.