A new norditerpenoid alkaloid, 16β-acetoxycardiopetaline (2), and two known alkaloids, neoline (1) and senbusine A (3), were isolated for the first time from the seeds of Aconitum napellus ssp. vulgare. The structure of alkaloid 2 was established on the basis of ir, mass,1 H-nmr,13 C-nmr, DEPT and 2D-nmr spectrometry. © 1994, Taylor & Francis Group, LLC. All rights reserved.