title: Structural determination of quercusides A and B, new flavonoid glucosides from Quercus incana, by 1D and 2D NMR spectroscopy.
abstract: Quercusides A and B, new flavonoid glucosides have been isolated from the chloroform soluble fractions of Quercus incana. Their structures were assigned from (1)H and (13)C nuclear magnetic resonance spectra, distortionless enhancement by polarization transfer (DEPT) and by correlation spectroscopy, heteronuclear multiple quantum correlation (HMQC) and heteronuclear multiple bond correlation (HMBC) experiments. Lupeol, beta-sitosterol and ursolic acid have also been reported from this species.
authors.affiliation: Department of Chemistry, University of Karachi, Karachi-75270, Pakistan.
authors.forename: Benish
authors.initials: B
authors.lastname: Iftikhar
authors.forename: Shagufta
authors.initials: S
authors.lastname: Perveen
authors.forename: Abdul
authors.initials: A
authors.lastname: Malik
authors.forename: Najma
authors.initials: N
authors.lastname: Sultana
authors.forename: Saeed
authors.initials: S
authors.lastname: Arayne
authors.forename: Pir
authors.initials: P
authors.lastname: Muhammad