Using CCCC[Sn](CCCC)(CCCC)c1cncs1, Oc1cccc(-c2nc(Br)c3sccc3n2)c1 to produce Oc1cccc(-c2nc(-c3cncs3)c3sccc3n2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.