Using CC(C)(C)OC(=O)N1CCc2ccc(Cl)c(SCC#N)c2CC1, BrCCBr to produce CC(C)(C)OC(=O)N1CCc2ccc(Cl)c(SC3(C#N)CC3)c2CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.