title: Further polyoxypregnanes from Marsdenia tenacissima.
abstract: Two new polyoxypregnanes, designated marstenacigenins A and B, along with a known compound, dresgenin, were isolated from the mild acid hydrolysate of the ethanol extract of the stems of Marsdenia tenacissima. Their structures were deduced by a combination of 1D and 2D NMR spectroscopic techniques as 12 beta-cinnamoyl-dihydrosarcostin and 12 beta,20-dibenzoyldihydrosarcostin, respectively.
authors.affiliation: Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago 60612, USA.
authors.forename: S X
authors.initials: SX
authors.lastname: Qiu
authors.forename: S Q
authors.initials: SQ
authors.lastname: Luo
authors.forename: L Z
authors.initials: LZ
authors.lastname: Lin
authors.forename: G A
authors.initials: GA
authors.lastname: Cordell
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D010946:Plants, Medicinal; D011278:Pregnanes / Q000737:chemistry* / Q000302:isolation & purification*; D013329:Structure-Activity Relationship
chemical_list: D011278:Pregnanes