3-[(2S)-1,2,3,6-tetrahydropyridin-2-yl]pyridine;S-(-)-ANATABINE;ANABATINE;(2S)-2-(3-Pyridyl)-1,2,3,6-tetrahydropyridine;[2S,(-)]-1,2,3,6-Tetrahydro-2,3'-bipyridine;(S)-1,2,3,6-tetrahydro-2,3'-bipyridine;Nicotine EP Impurity A (Anatabine);Nicotine EP Impurity A