Using CCCC[Sn](CCCC)(CCCC)c1cnccn1, Cc1ccncc1-c1ccnn2c(I)cnc12 to produce Cc1ccncc1-c1ccnn2c(-c3cnccn3)cnc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.