Using COc1ccc(O[C@H]2O[C@H](C)[C@H](O)[C@H](O)[C@H]2OC(=O)CCC(C)=O)cc1, BrCc1ccccc1 to produce COc1ccc(O[C@H]2O[C@H](C)[C@H](O)[C@H](OCc3ccccc3)[C@H]2OC(=O)CCC(C)=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.