Using OC[C@H]1O[C@](O)(c2ccc(Cl)c(Cc3ccc(O)cc3)c2)[C@H](O)[C@@H](O)[C@@H]1O, COC(=O)C1(Br)CCCC1 to produce COC(=O)C1(Oc2ccc(Cc3cc([C@@]4(O)O[C@H](CO)[C@@H](O)[C@H](O)[C@H]4O)ccc3Cl)cc2)CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.