Using CCCC[Sn](CCCC)(CCCC)c1ccc(C)cn1, COC(=O)c1cc(Br)cc(OC)c1 to produce COC(=O)c1cc(OC)cc(-c2ccc(C)cn2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.