Using O=C(CO)[C@@H](O)[C@H](O)[C@@H](O)CO to produce CC1(C)OC[C@@H]2O[C@@]3(CO)OC(C)(C)O[C@H]3[C@@H]2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.