niacin molecule, molecular structure, nicotinic acid, ball and stick 3d model, structural chemical formula with colored atoms

niacin vitamer vitamin nicotinic acid molecule molecular structure chemical formula model c6h5no2 atom chemistry science medicine symbol organic compound supplement niacinamide education medical research scientific composition drawing health skeletal cholesterol element illustration nutrient technology food nicotinamide vitamine biology atomic biochemistry deficiency healthy icon line coenzyme ball stick structural colored atoms