From the aerial Parts of Delphinium cyphoplectrum Boiss.,a new norditerpene
alkaloid named cyphoplectine has been isolated along with the known nordit
erpene alkaloids browniine and delphatine. The structure of cyphoplectine w
as established on the basis of H-1, C-13, APT, homonuclear H-1 COSY, HETCOR
and NOESY NMR studies. The alkaloidal mixture showed slight antifeedant an
d insect repellent activities.