Using CCOC(=O)C(CC1CCN(C(=O)OC(C)(C)C)C1)C(=O)OCC to produce CCOC(=O)C(CC1CCN(C(=O)OC(C)(C)C)C1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.