Using Fc1c(F)c(Br)c2nsnc2c1Br, CCCC[Sn](CCCC)(CCCC)c1cccs1 to produce Fc1c(F)c(-c2cccs2)c2nsnc2c1-c1cccs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.