Using CCCC[Sn](CCCC)(CCCC)c1ccc(C)cn1, Brc1cccc(Br)c1 to produce Cc1ccc(-c2cccc(-c3ccc(C)cn3)c2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.