A new nordirerpenoid alkaloid designated as ajadinine [1] has been isolated from the seeds of Delphinium ajacis. Its structure [1] was established from physical and spectroscopic data. The known alkaloids desoline, delcosine, and gigactonine have also been obtained from this same source. Complete and unambiguous nmr assignments for the lycoctonine-type norditerpenoid alkaloids 14-deacetylajadine [2], ajacine [3], delcosine [4], and ambiguine [5] are also presented in this work. Assignments for the aromatic protons of the C-18 N-acetyl anthranilic acid ester group were made by selective INEPT nmr experiments.