Using CC(=O)c1cc(Br)c(Sc2ccc(Cl)cc2Cl)s1, N#C[Cu] to produce CC(=O)c1cc(C#N)c(Sc2ccc(Cl)cc2Cl)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.