Using CCOC(=O)C1C(=O)C[C@@H]2CC3(C[C@H]12)OCCO3 to produce CCOC(=O)[C@@H]1[C@H]2CC3(C[C@H]2C[C@H]1O)OCCO3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.