Using COc1ccc(Br)c2c(OC)ccc(Br)c12, CCCC[Sn](CCCC)(CCCC)c1cccs1 to produce COc1ccc(-c2cccs2)c2c(OC)ccc(-c3cccs3)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.