Using Cc1csc(Nc2ncc(Br)cc2Sc2cccc(C(N)=O)c2)n1 to produce Cc1csc(Nc2ncc(Br)cc2Sc2cccc(C#N)c2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.