Using CC(=O)SC1C(C2COC(C)(C)O2)OC2OC(C)(C)OC21 to produce CC1(C)O[C@H]2O[C@H]([C@H]3COC(C)(C)O3)C[C@H]2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.