nicotinic acid /(?)/

nic·o·tin·ic ac·id

nicotinic acid

n.
  1. An organic acid (C6H5NO2), a carboxylated derivative of pyridine, obtained by the oxidation of nicotine; called also niacin and antipellagra vitamin, and vitamin B5. Chemically it is 3-pyridinecarboxylic acid. (Chem.)