Studies on the Constituents of Achyranthis Radix. II. : Isolation of the Insectmoulting Hormones

Methanolic and aqueous extracts of the root of Achyranthes fauriei (Japanese name "Hinatanoinokozuchi") (Amaranthaceae) were extracted with ethyl acetate and, from the soluble portion, two kinds of crystalline component, one of m.p. 255°(decomp.)(II) and the other of m.p. 242°(decomp.) (VI), and dimethyl sulfone (III), m.p. 105∼108°, were isolated. II and VI showed a marked activity for metamorphosis of insects. VI was identified with ecdysterone (I), an insect metamorphosis hormone. II is a new substance and was named inokosterone.

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