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作 者 ：Song Chun-qing, Zheng Zhi-ren, Liu Di and Hu Zhi-bi

Keywords:Astragalus membranaceus, Antimicrobials, (3R)-8, 2‘‘-dihydroxy-7, 4‘‘-dimethoxy-isoflavan, (3 R) -7, 2‘‘, 3‘‘-trihydroxy-4‘‘- methoxyisoflavan,

Abstract:Two new antimicrobial isoflavans, (3R)-8,2‘-dihydroxy-7,4‘-dimethoxyisoflavan and (3R)-7,2‘, 3‘-trihydroxy-4‘-methoxyisoflavan were isolated from root of Astragalus membranaceus (Fisch.) Bnnge. Their structures were elucidated by means of chemical conversions and spectral analysis.

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