Using CCCC[Sn](CCCC)(CCCC)c1ccccn1, COC(=O)c1cc(Br)c(=O)n(C)c1 to produce COC(=O)c1cc(-c2ccccn2)c(=O)n(C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.