Using BrC(Br)(Br)Br, CC(C)(C)OC(=O)CN1C(=O)c2ccc(N(CCO)S(C)(=O)=O)cc2C1=O to produce CC(C)(C)OC(=O)CN1C(=O)c2ccc(N(CCBr)S(C)(=O)=O)cc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.