From the Chinese crude drug, "Kushen"(Japanese name "Kujin") (the root of Sophora flavescens AIT.) five new flavonoids, kuraridinol (I), kurarinol (II), neokurarinol (III), nor-kurarinol (IV), isokurarinone (V) (each named by us) and formononetin were isolated, whose structures have been established by spectral and chemical data.
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Kyogoku et al. (1973) studied this question.