title: A new ethylene glycol triterpenoid from the leaves of Psidium guajava.
abstract: One new pentacyclic triterpenoid psidiumoic acid (5) along with four known compounds beta-sitosterol (1), obtusol (2), oleanolic acid (3), and ursolic acid (4) have been isolated from the leaves of Psidium guajava. The new constituent 5 has been characterized as 2 alpha-glycolyl-3beta-hydroxyolean-12-en-28-oic acid through 2D NMR techniques. This is the first report of isolation of compound 2 from the genus Psidium.
authors.affiliation: H.E.J. Research Institute of Chemistry, International Center for Chemical Sciences, University of Karachi, Karachi 75270, Pakistan. sabira@khi.comsats.net.pk
authors.forename: Sabira
authors.initials: S
authors.lastname: Begum
authors.forename: Syed Nawazish
authors.initials: SN
authors.lastname: Ali
authors.forename: Syed Imran
authors.initials: SI
authors.lastname: Hassan
authors.forename: Bina S
authors.initials: BS
authors.lastname: Siddiqui
mesh_terms: D005026:Ethylene Glycols / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D031647:Psidium / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D005026:Ethylene Glycols; D010936:Plant Extracts; D014315:Triterpenes