title: Structure determination of new steroids from Abutilon pakistanicum by NMR techniques.
abstract: Two new steroids provisionally named as pakisteroid-A (1) and pakisteroid-B (2) have been isolated in crystalline form from Abutilon pakistanicum. Their structures have been assigned as 3-O-beta-D-glucopyranosyl-stigmasta-5,11(12)-diene (1) and 24beta-ethylcholesta-5, 9(11), 22E-trien-3beta-benzoate (2), respectively through extensive NMR studies.
authors.affiliation: International Center for Chemical and Biological Sciences, H.E.J. Research Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan.
authors.forename: Munawar
authors.initials: M
authors.lastname: Hussain
authors.forename: Durey Nayab
authors.initials: DN
authors.lastname: Zahra
authors.forename: S M Shakil
authors.initials: SM
authors.lastname: Hussain
authors.forename: Ejaz
authors.initials: E
authors.lastname: Ahmed
authors.forename: Ijaz
authors.initials: I
authors.lastname: Ahmad
authors.forename: Abdul
authors.initials: A
authors.lastname: Malik
authors.forename: Zaheer
authors.initials: Z
authors.lastname: Ahmed
mesh_terms: D002247:Carbon Isotopes; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards*; D019660:Malvaceae / Q000737:chemistry*; D015394:Molecular Structure; D010154:Pakistan; D035261:Plant Components, Aerial / Q000737:chemistry*; D011522:Protons; D013256:Steroids / Q000737:chemistry*
chemical_list: C528021:24beta-ethylcholesta-5, 9(11), 22E-trien-3beta-benzoate; C528020:3-O-beta-D-glucopyranosyl-stigmasta-5,11(12)-diene; D002247:Carbon Isotopes; D011522:Protons; D013256:Steroids