title: New pregnane glycoside derivative from Caralluma retrospiciens (Ehrenb).
abstract: Retrospinoside (1) is a new polyoxy pregnane glycoside which was isolated and characterised from the aerial parts of Caralluma retrospiciens (Ehrenb.) N. E. Br., family Apocynaceae. The structure was established as 3-O-[β-D-glucopyranosyl-(1 → 4)-β-D-(3-O-methyl-6-desoxygalactopyranosy)]-14,15,20-trihydroxy-4β-pregnane. Its structural elucidation was performed through extensive spectroscopic measurements including 1D- and 2D-NMR, and HRMS, in addition to chemical methods.
authors.affiliation: a Department of Pharmacognosy , Faculty of Pharmacy, Mansoura University , Mansoura , Egypt.
authors.forename: Mahmoud Fahmi
authors.initials: MF
authors.lastname: Elsebai
authors.forename: Ietidal El-Tahir
authors.initials: Iel-T
authors.lastname: Mohamed
mesh_terms: D029062:Apocynaceae / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D015394:Molecular Structure; D035261:Plant Components, Aerial / Q000737:chemistry*; D011278:Pregnanes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D006027:Glycosides; D011278:Pregnanes; C574437:pregnane glycoside; C000601327:retrospinoside
keywords: Caralluma retrospiciens; plant natural products; polyoxy pregnanes; pregnane glycosides