Nicotinamide mononucleotide

Nicotinamide mononucleotide ("NMN" and "β-NMN") is a nucleotide derived from ribose, nicotinamide, nicotinamide riboside and niacin. In humans, several enzymes use NMN to generate nicotinamide adenine dinucleotide (NADH).

Source: Wikipedia — Nicotinamide mononucleotide (CC BY-SA 4.0)