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Two new diterpenoid alkaloids, Guan-Fu base J (GFJ, 1) and Guan-Fu base N (GFN, 2) along with nineteen known alkaloids (3–21) were isolated from the roots of Aconitum coreanum (Lèvl.) Rapaics, which is the raw material of a new approval anti-arrhythmia drug “Acehytisine Hydrochloride”. The structures of isolated compounds were established by means of 1D, 2D NMR spectroscopic and chemical methods....