Using CCCC[Sn](Cl)(CCCC)CCCC, Cc1nc(C)n2ccsc12 to produce CCCC[Sn](CCCC)(CCCC)c1cn2c(C)nc(C)c2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.