Studies on the Constituents of Asclepiadaceae Plants. XLI. Component of Cynanchum caudatum MAX. Structure of Glycopenupogenin

Abstract

A new polyoxypregnane having 5α, 6β-hydroxyl groups, glycopenupogenin (I), was isolated from Cynanchum caudatum MAX., and its structure was elucidated on the bases of physical data and chemical reactions. I was found to be identical with a derivative obtained by the glycolation of penupogenin (IV), which had been isolated from the same plant.