Using CCOC(=O)[C@@H]1CC(OCC)(OCC)[C@H]1C(=O)OCC to produce CCOC1(OCC)C[C@@H](C(=O)O)[C@@H]1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.