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.
