Using O=C1C=C2c3cccc(I)c3CCN2C(=O)CN1, CCCC[Sn](CCCC)(CCCC)c1cscn1 to produce O=C1C=C2c3cccc(-c4cscn4)c3CCN2C(=O)CN1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.