Using CCCC[Sn](CCCC)(CCCC)c1cccnc1F, CCNc1ncccc1-c1sccc1Br to produce CCNc1ncccc1-c1sccc1-c1cccnc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.