Using CC1CN(C(=O)C(F)(F)F)CCc2c(Br)cc(=O)[nH]c21 to produce CC1CN(C(=O)C(F)(F)F)CCc2ccc(=O)[nH]c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.