The Diterpenoid Alkaloids of Delphinium tatsienense Franch

From the roots of Delphinium tatsienense Franch (Ranunculaceae) two new and six known alkaloids have been isolated. The isolation and structure determination of deacetylambiguine (2) and a novel C 19 -diterpenoid alkaloid designated as tatsiensine (1) are described. The structure of tatsiensine was established on the basis of spectroscopic data and correlation with delpheline (12). Deacetylambiguine (2) has been isolated for the first time from a natural source. The known alkaloids that were isolated are the C 19 -diterpenoid alkaloids, browniine (3), delcosine (4), lycoctonine (8), and the C 20 -alkaloids ajaconine (6), hetisine (7) and hetisinone (5).