Using CCCC[Sn](Cl)(CCCC)CCCC, C=CCn1ccnc1-c1sccc1-c1ccc(Cl)cc1Cl to produce C=CCn1ccnc1-c1sc([Sn](CCCC)(CCCC)CCCC)cc1-c1ccc(Cl)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.