N-[4-(1-Benzoyl-4-piperidinyl)butyl]-3-(3-pyridinyl)-2-propenamide Hydrochloride is a salt form of FK866 (F370030), which is a highly specific noncompetitive inhibitor of nicotinamide phosphoribosyltransferase (NMPRTase), which induces tumor cell apoptosis, and thus is a potential anticancer drug.