Using Cc1c(I)ccc(N)c1C#N, CCCC[Sn](CCCC)(CCCC)c1ccc(Cl)s1 to produce Cc1c(-c2ccc(Cl)s2)ccc(N)c1C#N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.