Using COC1O[C@@H](CO)[C@@H](O)[C@@H]1O, ClCc1ccc(Cl)cc1Cl to produce COC1O[C@@H](COCc2ccc(Cl)cc2Cl)[C@@H](OCc2ccc(Cl)cc2Cl)[C@@H]1OCc1ccc(Cl)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.