Using CC(=O)OC[C@H]1OC(OC(C)=O)[C@@H](OC(C)=O)[C@@H](OC(C)=O)[C@@H]1OC(C)=O, OCCBr to produce CC(=O)OC[C@H]1O[C@H](OCCBr)[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.