Using O=C(O[C@H]1CO[C@H]2[C@@H]1OC[C@@H]2OC(=O)c1ccccc1)c1ccccc1 to produce O[C@H]1CO[C@H]2[C@@H]1OC[C@@H]2O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.