Using C[Sn](C)(C)c1ccc2nc(C(=O)Nc3ccccc3)cn2c1, Nc1cccc(Br)n1 to produce Nc1cccc(-c2ccc3nc(C(=O)Nc4ccccc4)cn3c2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.