NMN zwitterion is a nicotinamide mononucleotide. It has a role as an Escherichia coli metabolite and a mouse metabolite. It is a conjugate base of a NMN(+). It is a conjugate acid of a NMN(-).3-Carbamoyl-1-beta-D-ribofuranosyl pyridinium hydroxide-5'phosphate, inner salt. A nucleotide in which the nitrogenous base, nicotinamide, is in beta-N-glycosidic linkage with the C-1 position of D-ribose. Synonyms: Nicotinamide Ribonucleotide; NMN.