Using CC(C)(C)O, O=C1CC(C(=O)O)C(C(=O)OC(c2ccccc2)c2ccccc2)O1 to produce CC(C)(C)OC(=O)C1CC(=O)OC1C(=O)OC(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.