New C₂₀-Diterpenoid Alkaloids from Delphinium laxicymosum var pilostachyum

Abstract

From the whole herb of Delphinium laxicymosum var pilostachyum, three new C 20-diterpenoid alkaloids, laxipilostine, laxipilosdine, and laxipilosline (1-3), were isolated, together with fourteen known diterpenoid alkaloids. Their structures were determined by extensively interpretation of their spectroscopic data (1D-and 2D-NMR, MS, and IR).