Using CC(=O)OC[C@H]1O[C@@H](c2ccc(C)c(Cc3cccs3)c2)[C@H](OC(C)=O)[C@@H](OC(C)=O)[C@@H]1OC(C)=O, BrBr to produce CC(=O)OC[C@H]1O[C@@H](c2ccc(C)c(Cc3ccc(Br)s3)c2)[C@H](OC(C)=O)[C@@H](OC(C)=O)[C@@H]1OC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.