Using BrCCCBr, CCSC1=C(C#N)C(c2ccccc2)(c2ccccc2)C(=O)N1 to produce CCSC1=C(C#N)C(c2ccccc2)(c2ccccc2)C(=O)N1CCCBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.