Using [C-]#N, Cn1c2cccc(Br)c2c2c(CBr)nn(-c3ccccc3)c(=O)c21 to produce Cn1c2cccc(Br)c2c2c(CC#N)nn(-c3ccccc3)c(=O)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.