Using CC(C)(C)OC(=O)C(=O)OC(C)(C)C, CC(=O)c1cccc(Cl)c1 to produce CC(C)(C)OC(=O)C(=O)CC(=O)c1cccc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.