Two new norditerpenoid alkaloids, ouvrardianines A and B (1 and 2, resp.), together with eight known compounds, were isolated from Aconitum ouvrardianum. The structures of the new compounds were elucidated as (1α,6α, 14α,16β)-8-(acetyloxy)-13-hydroxy-1,6,16-trimethoxy-4-(methoxymethyl) -aconit-19-en-14-yl benzoate (1) and (1α,6α,14aα,16β)-8- (acetyloxy)-20-formyl-13-hydroxy-1,6,16-trimethoxy-4-(methoxymethyl) aconitan-14-yl benzoate (2) on the basis of spectral analyses. The new compound 1 was found to contain the rare C(19)=N imine group. © 2009 Verlag Helvetica Chimica Acta AG.