Using COC(C)(C)OC, O=C[C@H](O)[C@H](O)[C@H](O)CO to produce CC1(C)O[C@@H]2[C@@H](CO)OC(O)[C@@H]2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.