Using [Br-], CC1(C)OC[C@@H](COc2ccc(CCCOS(C)(=O)=O)cc2)O1 to produce CC1(C)OC[C@@H](COc2ccc(CCCBr)cc2)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.