Using CCCC[Sn](Cl)(CCCC)CCCC, Cc1nn(C)c2sccc12 to produce CCCC[Sn](CCCC)(CCCC)c1cc2c(C)nn(C)c2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.