Using Clc1ccc2ncc(Br)n2n1, CCCC[Sn](CCCC)(CCCC)c1cc2ccncc2o1 to produce Clc1ccc2ncc(-c3cc4ccncc4o3)n2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.