Using CC1=C(C(=O)OCOC(=O)C(C)(C)C)N2C(=O)C[C@H]2C1=O to produce CC1=C(C(=O)OCOC(=O)C(C)(C)C)N2C(=O)C[C@H]2C1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.