Using CC(C)(C)OC(=O)COc1ccc(C(=O)OCc2ccccc2)cc1OCC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)COc1ccc(C(=O)O)cc1OCC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.