nicotinamide mononucleotide, nmn molecule. it is naturally anti-aging metabolite, precursor of nad+. molecule model. sheet of

nicotinamide mononucleotide nmn nad niacin molecule precursor skeletal nucleotide adenine dinucleotide vitamin b3 mitochondria energy ageing antiaging ribose science drawing flat icon hydrogen carbon oxygen organic chemistry structural formula chemical atomic molecular structure atom compound sheet notebook cage vector