Using CC(CNS(=O)(=O)C(C)C)c1ccc(Br)cc1, CCCC[Sn](CCCC)(CCCC)c1ccco1 to produce CC(CNS(=O)(=O)C(C)C)c1ccc(-c2ccco2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.