Using Clc1ccc(-c2ccccn2)nn1, CCCC[Sn](CCCC)(CCCC)c1cccc(C)n1 to produce Cc1cccc(-c2ccc(-c3ccccn3)nn2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.