Using COc1ccc(CN2CCc3cc(CC#N)ccc3C2=O)cc1, BrCCBr to produce COc1ccc(CN2CCc3cc(C4(C#N)CC4)ccc3C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.