Hypaconitine (0.048%), aconitine (0.010%), and mesaconitine (0.006%) were isolated from Aconitum carmichaeli DEBX. (crude drug Sen-uzu) by means of alumina column chromatography. A new alkaloid, tentatively named carmichaeline, was isolated from the water-soluble basic fraction as colorless prisms, m.p. 185~186°, C₂₂H₃₅O₄N, [α]₃₅ -16.7°