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Chemical Constituents of Astragali Radix,the Root of As-tragalus membranaceus Bunge.(2).AstragalosidesⅠ,ⅡandⅣ,Acetylastragaloside I and IsoastragalosidesⅠandⅡ. Isao Kitagawa,,Hui Kang Wang,Masayuki Saito,et al. Chemical and Pharmaceutical Bulletin . 1983