title: Triterpenes from Euphorbia rigida.
abstract: Phytochemical studies of the aerial parts of Euphorbia rigida afforded three triterpenes: betulin (1), cycloart-23Z-ene-3, 25-diol (2) and cycloartan-3, 24, 25-triol (3), firstly isolated from this plant. The structures and relative stereochemistry were determined on the basis of extensive spectroscopic analyses, including 1D and 2D NMR experiments (1H NMR, 13C NMR, COSY, NOESY, HMQC and HMBC).
authors.affiliation: Laboratory of Natural Products and Organic Synthesis, Department of Chemistry, Faculty of Science, University Mentouri - Constantine, Algeria.
authors.forename: Noureddine
authors.initials: N
authors.lastname: Gherraf
authors.forename: Amar
authors.initials: A
authors.lastname: Zellagui
authors.forename: Naglaa S
authors.initials: NS
authors.lastname: Mohamed
authors.forename: Taha A
authors.initials: TA
authors.lastname: Hussien
authors.forename: Tarik A
authors.initials: TA
authors.lastname: Mohamed
authors.forename: Mohamed-Elamir F
authors.initials: ME
authors.lastname: Hegazy
authors.forename: Salah
authors.initials: S
authors.lastname: Rhouati
authors.forename: Mahmoud F M
authors.initials: MF
authors.lastname: Moustafa
authors.forename: Magdi A
authors.initials: MA
authors.lastname: El-Sayed
authors.forename: Abou El-Hamd H
authors.initials: Ael-H
authors.lastname: Mohamed