A study of the alkaloids present in the seeds of Delphinium elatum L. has led to the isolation of three new C19-diterpenoid alkaloids: elasine (1), isodelpheline (3) and eladine (5), besides seven known alkaloids: delpheline (7), deltaline (8), methyllycaconitine (10), nudicauline (11), 14-deacetylnudicauline (12), lycoctonine and elatine (13). The structures of these alkaloids were determined by spectral data and correlation with alkaloids of established structures. Thus methylation of elasine (1) and eladine (5) yielded deltaline (8) and delpheline (7), respectively. © 1989.