Using O=C(c1cncc(-c2ccccc2)c1)c1ncn2ccsc12, CCCC[Sn](Cl)(CCCC)CCCC to produce CCCC[Sn](CCCC)(CCCC)c1cn2cnc(C(=O)c3cncc(-c4ccccc4)c3)c2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.