Using CCCC[Sn](Cl)(CCCC)CCCC, Ic1cc(-c2cccs2)ccn1 to produce CCCC[Sn](CCCC)(CCCC)c1cc(-c2cccs2)ccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.