Studies on the Constituents of Marsdenia formosana MASAMUNE. III. : Isolation and Structural Elucidation of Some New Steroidal Glycosides

Abstract

From the methanolic extracts of Marsdenia formosana MASAMUNE (Asclepiadaceae), three new steroidal glycosides, MF-A, MF-C and MF-D, together with β-sitosterol-3β-D-glucoside (VIII) and dehydrotomentosin (I) were isolated. As the results of spectroscopic and chemical investigations, it has been demonstrated that the stereostructures of MF-A, MF-C and MF-D were represented, respectively, by the formulas II, IV and VI.