Steroid saponins and sapogenins ofAllium. XIX. The structure of karatavigenin C

Two new steroid glycosides of the spirostan series — karataviosides E and F — have been isolated from inflorescences ofAllium karataviense Regel. Smith degradation of these compounds has given a steroid sapogenin, karatavigenin C, which is (25S)-spirost-5-ene-2,3,24S-triol. Its structure was established from an analysis of spectral characteristics.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 736–740, November–December, 1983.