3d image of nicotinic acid skeletal formula

nicotinic acid niacin vitamin b3 nicotine pathway reaction supplement dissociation derivative overdose mechanism deficiency nicotinamide hair bionic nutrient c6h5no2 pyridinecarboxylic food pellagra niacinamide nad nadp precursor e375 additive 3d rendering molecule molecular structural structure formula skeletal compound functional group drug side effect action iatrogenic metabolism biosynthesis synthesis