niacin molecular structure, 3d model molecule, nicotinic acid, structural chemical formula view from a microscope

niacin vitamer of vitamin b3 nicotinic acid molecule molecular structure chemical formula 3d model c6h5no2 atom chemistry science medicine symbol organic compound supplement niacinamide education medical research scientific composition drawing health skeletal cholesterol element nutrient technology food nicotinamide vitamine biology atomic biochemistry deficiency healthy line coenzyme