Using CCCC[Sn](Cl)(CCCC)CCCC, CC(C)(C)c1ccnc(Br)c1 to produce CCCC[Sn](CCCC)(CCCC)c1cc(C(C)(C)C)ccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.