Using CCCC[Sn](Cl)(CCCC)CCCC, CCOC(OCC)c1cccs1 to produce CCCC[Sn](CCCC)(CCCC)c1ccc(C(OCC)OCC)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.