Using CCCC[Sn](CCCC)(CCCC)c1cccs1, CCOC(=O)Cc1cc(Br)sc1Br to produce CCOC(=O)Cc1cc(-c2cccs2)sc1-c1cccs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.