Using CCCC[Sn](Cl)(CCCC)CCCC, c1csc(C23CCN(CCO2)C3)n1 to produce CCCC[Sn](CCCC)(CCCC)c1cnc(C23CCN(CCO2)C3)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.