Using CCc1ccc(Cc2cc(C3(O)O[C@H](COC(C)=O)[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]3OC(C)=O)cc(Br)c2C)cc1, OB(O)C1CC1 to produce CCc1ccc(Cc2cc(C3(O)O[C@H](COC(C)=O)[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]3OC(C)=O)cc(C3CC3)c2C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.