Using O=C[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO, CC(=O)CC(C)=O to produce CC(=O)CC1OC(CO)C(O)C(O)C1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.