3-Carbamoyl-1-?-D-ribofuranosylpyridinium Chloride is an intermediate in the synthesis of ?-Nicotinamide Mononucleotide (N751270), used as a reagent in the reaction with with NADPase of tooth ameloblast for correlated biochemical and cytochemical studies of nicotinamide adenine dinucleotide phosphatase (NADPase) activity.