Using C=CCNC1=NC2C(O[C@H](COC(C)=O)[C@@H](OC(C)=O)[C@@H]2OC(C)=O)S1 to produce C=CCNC1=NC2C(O[C@H](CO)[C@@H](O)[C@@H]2O)S1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.