title: Structural determination of silymins A and B, new pentacyclic triterpenes from Silybum marianum, by 1D and 2D NMR spectroscopy.
abstract: Silymins A (1) and B (2), the new pentacyclic triterpenes, have been isolated from ethyl acetate fraction of Silybum marianum and their structures assigned from 1H and 13C NMR spectra, DEPT and by 2D COSY, NOE and HMBC experiments.
authors.affiliation: International Center for Chemical Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan.
authors.forename: Ejaz
authors.initials: E
authors.lastname: Ahmed
authors.forename: Atia
authors.initials: A
authors.lastname: tun Noor
authors.forename: Abdul
authors.initials: A
authors.lastname: Malik
authors.forename: Sadia
authors.initials: S
authors.lastname: Ferheen
authors.forename: Nighat
authors.initials: N
authors.lastname: Afza
mesh_terms: D003500:Cyclization; D006859:Hydrogen; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D020944:Silybum marianum / Q000737:chemistry*; D012015:Reference Standards; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D014315:Triterpenes; C517512:silymin A; C517513:silymin B; D006859:Hydrogen