Abstract: Five alkaloids were isolated from the Chinese drug, Aconitum kusnezoffii collected from Ghifeng in Inner Mongolia, four of them were identified as deoxyaconitine, hypaconitine, aconitine and mesaconitine respectively by comparing their physical and chemical properties with those of authentic samples. The fifth alkaloid melting at 196～8℃ with the empirical formula G₃₃H₄₅NO₁₂ was found to be a new compound. By means of interpretation of its IR and NMR spectra its structure may be suggested as Fig. I. It is named beiwutine.