Using CCCC[Sn](CCCC)(CCCC)c1ccncc1, Fc1ccc(-c2cnc3nc(C(F)(F)F)ccn23)cc1Br to produce Fc1ccc(-c2cnc3nc(C(F)(F)F)ccn23)cc1-c1ccncc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.