Studies on the Constituents of the Aerial Parts of Dioscorea tenuipes FRANCH. et SAVAT. IV. 2β, 3α, 4β-Trihydroxy-5β-pregn-16-en-20-one and Its 2- and 4-Monoacetates

抄録

Three kinds of pregnane derivatives G₅, G₆, and G₇ were isolated from the aerial parts of Dioscorea tenuipes FRANCH. et SAVAT. They were characterized as 2β, 3α, 4β-trihydroxy-5β-pregn-16-en-20-one (IV) and its 2-(VII) and 4-monoacetates (VIII), respectively, which are corresponding to coexisting diotigenin (I) and its monoacetates (II and III).