From Aconitum napellus L. subsp. castellanum J. Molero et C. Blanché, were isolated three new diterpenoid alkaloids, 12-epidehydronapelline (1), 12-epi-acetyldehydronapelline (2), and 1,14-diacetylneoline (6), together with neoline (7), aconitine, and songoramine (5). The structures of the new bases were determined by spectroscopic data and chemical correlation. © 1988.