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《Acta Chimica Sinica》 1983-12
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THE STRUCTURE OF ASTRAMEMBRANGENIN

CAO ZHENG-ZHONG YU JIA-HUA (Nanjing Institute of Materia Medico) GAN LI-XIAN~* ZHOU WEI-SHAN(Shanghai Institute of Organic Chemistry, Academia Sinica)  
Three Astragalus saponins Ⅰ, Ⅱ, Ⅲ hav been isolated from roots of A. membranaceus Bunge (Leguminosae). Astragalus saponin I is the major constituent. The structure of astramembangenin C_(30)H_(50)O_5 obtained from saponin I by Smith's oxidative degradation with NaIO_4 followed by NaBH_4 reduction, was assigned as 1 by means of spectroscopic analysis (IR, ~1H NMR, ~(13)C NMR and MS) as well as chemical degradation. The configuration of C_(20) and C_(24) of 1 was established as S and R respectively by means of ~1H NMR spectroscopy using lanthanide shift reagent.
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