Using [C-]#N, Cc1cc(-c2c(-c3ccccc3)c3cc(Br)ccc3[nH]c2=O)on1 to produce Cc1cc(-c2c(-c3ccccc3)c3cc(C#N)ccc3[nH]c2=O)on1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.