Anpirtoline (also known as Anpirtolina, Anpirtolinum, 16949, 6-chlor-2-(piperidyl-4-thio)pyridine, 6-chloro-2-(piperidyl-4-thiol)pyridine, Anpirtoline free base, 4-((6-Chloro-2-pyridyl)thio)piperidine, Ncgc00024740-02, 2-Chloro-6-(piperidin-4-ylthio)pyridine or Cas-98330-05-3) is a substance of the pyridine class.