title: Polyhydroxypregnane glycosides from Oxystelma esculentum var. alpini.
abstract: Three new polyhydroxypregnane glycosides named alpinoside A [kidjolanin 3-O-beta-d-glucopyranosyl-(1-->4)-beta-d-glucopyranosyl-(1-->4)-beta-d-thevetopyranosyl-(1-->4)-beta-d-cymaropyranosyl-(1-->4)-beta-d-cymaropyranoside], alpinoside B [kidjolanin 3-O-beta-d-glucopyranosyl-(1-->4)-beta-d-thevetopyranosyl-(1-->4)-beta-d-cymaropyranosyl-(1-->4)-beta-d-cymaropyranoside], and alpinoside C [kidjolanin 3-O-beta-d-glucopyranosyl-(1-->4)-beta-d-glucopyranosyl-(1-->4)-beta-d-oleandropyranosyl-(1-->4)-beta-d-cymaropyranosyl-(1-->4)-beta-d-cymaropyranoside] were isolated from the leaves of Oxystelma esculentum var. alpini. The structure elucidation was accomplished by extensive spectroscopic analysis and acid-catalyzed hydrolysis.
authors.affiliation: Faculty of Science, South Valley University, Aswan 81528, Egypt.
authors.forename: Arafa I
authors.initials: AI
authors.lastname: Hamed
authors.forename: Mohamed G
authors.initials: MG
authors.lastname: Sheded
authors.forename: Abd El-Samei M
authors.initials: Ael-S
authors.lastname: Shaheen
authors.forename: Fatma A
authors.initials: FA
authors.lastname: Hamada
authors.forename: Cosimo
authors.initials: C
authors.lastname: Pizza
authors.forename: Sonia
authors.initials: S
authors.lastname: Piacente
mesh_terms: D029062:Apocynaceae / Q000737:chemistry*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002849:Chromatography, Gas; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D006868:Hydrolysis; D006900:Hydroxylation; D008969:Molecular Sequence Data; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D035261:Plant Components, Aerial / Q000737:chemistry; D011278:Pregnanes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D006027:Glycosides; D011278:Pregnanes