Structural determination of silymins A and B, new pentacyclic triterpenes from Silybum marianum, by 1D and 2D NMR spectroscopy.
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.
Ahmed
Ejaz
E
International Center for Chemical Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan.
tun Noor
Atia
A
Malik
Abdul
A
Ferheen
Sadia
S
Afza
Nighat
N
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
D014315:Triterpenes; C517512:silymin A; C517513:silymin B; D006859:Hydrogen