Main Reaction: 1-Methyl-△1-pyrrolinium cation + Nicotinic acid >> Nicotine

Reference: PubMed ID: 12242397
Authors: Kutchan TM
Title: Alkaloid Biosynthesis[mdash]The Basis for Metabolic Engineering of Medicinal Plants.
Published: 1995 Jul

1-Methyl-△1-pyrrolinium cation + Nicotinic acid --> Nicotine