Using CCOC(=O)CC(=O)C(Cc1ccccc1)NC(=O)OC(C)(C)C to produce CCOC(=O)CC(O)C(Cc1ccccc1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.