Using Ic1cn(C(c2ccccc2)(c2ccccc2)c2ccccc2)cn1, CCCC[Sn](Cl)(CCCC)CCCC to produce CCCC[Sn](CCCC)(CCCC)c1cn(C(c2ccccc2)(c2ccccc2)c2ccccc2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.