Studies on chemical constituents of antitumor fraction from Periploca sepium. V. Structures of new pregnane glycosides, periplocosides J, K, F and O.

Abstract

Four new pregnane glycosides, named periplocosides J, K, F and O, have been isolated from the antitumor fraction of Periploca sepium (Asclepiadaceae). Their structures were established by various nuclear magnetic resonance techniques and chemical evidence.