Using CC(=O)OCC1(COC(C)=O)Sc2cc3c(cc2S1)SC(COC(C)=O)(COC(C)=O)S3 to produce OCC1(CO)Sc2cc3c(cc2S1)SC(CO)(CO)S3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.