Two New C19‐Diterpenoid Alkaloids from Delphinium shawurense

Abstract Shawurenine C ( 1a ) and D ( 1b ), a new pair of regioisomeric C 19 ‐diterpenoid alkaloids, and five known C 19 ‐diterpenoid alkaloids ( 2 – 6 ) were isolated from the aerial part of Delphinium shawurense W. T. Wang. The chemical structures of new compounds were established based on spectroscopic analyses: HR‐ESI‐MS, and 1D, 2D NMR spectroscopic data. The anti‐inflammatory and cytotoxic activities of these diterpenoid alkaloids were also evaluated.