Using CCCC[Sn](Cl)(CCCC)CCCC, Cc1nc(-c2ccccc2)cs1 to produce CCCC[Sn](CCCC)(CCCC)c1sc(C)nc1-c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.