Abstract
Methanolic extract of the root of Pueraria Thunbergiana BENTH. (Japanese origin), and of P. pseudo-hirsuta TANG et WANG, and P. Thomsonii BENTH. (Chinese origin) was treated by the lead salt method and the portion precipitating with basic lead acetate afforded daidzein, m. p. 320° (decomp.), daidzin, m. p. 215-217° (decomp.), substance-e as needles, m. p. 187° (decomp.), C21H20O9, and substance-f as hygroscopic prisms. Substances e and f were assumed to be hitherto unknown isoflavone derivatives from their coloration characteristics and ultraviolet spectral examinations.
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