tropane alkaloid biosynthesis alkaloid biosynthesis scopolamine biosynthesis Biosynthesis of scopolamine (hyoscine), a tropane alkaloid compound with muscarinic antagonist effects. Scopolamine is obtained from plants of the family Solanaceae (nightshades), such as henbane or jimson weed (Datura species). It is among the secondary metabolites of these plants. UPa:UPA00725 GO:1900991 pathway hyoscine biosynthesis