Using CCOC(=O)CN1C(=O)[C@@H](NC(=O)OC(C)(C)C)CC(=O)c2ccccc21 to produce CCOC(=O)CN1C(=O)[C@@H](NC(=O)OC(C)(C)C)CC(O)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.