Using CC(=O)OC(C)=O, CC[C@H](OC(=O)C(C)C)[C@@H]1C[C@H]2OC(C)(C)O[C@H]2O1 to produce CC[C@H](OC(=O)C(C)C)[C@@H]1C[C@@H](OC(C)=O)[C@@H](OC(C)=O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.