Abstract
Gracillin, a new diosgenin glycoside which was present together with dioscin in the water-insoluble saponins obtained from the rhizome of Dioscorea gracillima Miq., was proved to be composed of one mole each of diosgenin and of L-rhamnose and two of D-glucose. It afforded two prosapogenins C and A on partial hydrolysis, both of which were isolated and proved to be trillin (diosgenin monoglucoside) and glucosidoglucoside, respectively. Two possible formulae (I) and (II) were proposed for gracillin.
