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alkaloids are the main toxic principles of the traditional oriental herb chuanwu(bu-shi), which havebeen used in Chinese materia medica mainly for the treatment of musculoskeletal disorders. They are biosynthesized viacyclization of geranylgeranyl pyrophosphate, incoporation of 2-aminoethanol and decarboxylation not via amino acid pathway,sub-jected to react with active manganese dioxide and oxoammonium salt as oxidants. The oxidation was proceeded as dealkylationwith aconitine type and dehydrogenations with lycoctonin type and heteratisine type.Key wordsnorditerpene alkaloid; aconitine type alkaloid; oxidation; active MnO2, oxoammonium salt...... ..... (norditerpene alkaloid). .. 19