Using CC(=O)CC(=O)OC(C)(C)C, COC(=O)c1ccc(Cl)c(C(=O)Cl)c1Cl to produce COC(=O)c1ccc(Cl)c(C(=O)C(C(C)=O)C(=O)OC(C)(C)C)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.