Structure and Toxicity of Narcotic Components of Celastrus angulatus

Two new compounds with narcotic action against armyworm ( Mythimna separata ) were isolated from the root bark of Celastrus angulatus . Their structures were determined as 1α，2α，6β，8β，13-pentaacetoxy-9β-benzoyl oxy-4β-hydroxy-β-dihydroagarofuran (Celangulin Ⅵ), 1α2α，6β-triacetoxy-8 α -( β -furancarbon yl oxy)-9β-benzoyloxy-13-isobutanoyloxy-4β-hydroxy-β-dihyd roagarofuran(Celangulin Ⅶ), mainly by NMR and MS spectra l data. The ND 50 values (the dose required to make the larval narcotized 50% of the papula tion of Mythimna separata ) for Celangulin Ⅵ and Ⅶ were 159.8 μg/g and 59.9 μg/g.