19-(R)- and 19-(S)-Hydroxydihydrokoumine from Gelsemium elegans

19-(R)- and 19-(S)-Hydroxydihydrokoumine from Gelsemium elegans Structures of (19R)-Kouminol and (19S)-Kouminol from Gelsemium elegans Two New 11‐Hydroxy‐Substituted Gelsedine‐Type Indole Alkaloids from the Stems of Gelsemium elegans Three oxindole alkaloids from Gelsemium species Two New 11‐Hydroxy‐Substituted Gelsedine‐Type Indole Alkaloids from the Stems of <i>Gelsemium elegans</i> Indole alkaloids isolated from Gelsemium elegans (Thailand): 19-(Z)-akuammidine, 16-epi-voacarpine, 19-hydroxydihydrogelsevirine, and the revised structure of koumidine. Indole alkaloids isolated from Gelsemium elegans (Thailand): 19-(Z)-akuammidine, 16-epi-voacarpine, 19-hydroxydihydrogelsevirine, and the revised structure of koumidine. New Monoterpenoid Indole Alkaloids from Gelsemium elegans Two New Koumine-Type Indole Alkaloids from Gelsemium elegans Benth. 19α-hydroxygelsamydine from Gelsemium elegans