ChEBI: (S)-nornicotine is a pyridine alkaloid that is nicotine lacking the methyl group on the pyrrolidine nitrogen. It has a role as a metabolite, a nicotinic acetylcholine receptor agonist and a phytogenic insecticide. It is a pyridine alkaloid and a pyrrolidine alkaloid. It is a conjugate base of a (S)-nornicotine(1+). It is an enantiomer of a (+)-Nornicotine. It derives from a hydride of a nicotine.