Six new norditerpenoid alkaloids from Delphinium elatum

Six new norditerpenoid alkaloid, N-formyl-4,19-secopacinine (1), iminoisodelpheline (2), iminodelpheline (3), iminopaciline (4), 6-dehydroeladine (5), and elapacidine (6), have been isolated from Delphinium elatum cv. Pacific Giant.