ajmaline biosynthesis PMID:11937349 PMID:12071952 pathway PMID:16874388 UPa:UPA00310 Biosynthesis of ajmaline, an antiarrhythmic monoterpenoid indole alkaloid. The ajmaline biosynthetic pathway expressed in the medicinal plant Rauvolfia serpentina (L.) Benth. ex Kurz. The pathway originates from rather simple precursors such as tryptamine on one side, and the monoterpenoid glucoside secologanin on the other side. alkaloid biosynthesis terpenoid indole alkaloid biosynthesis