title: Triterpenoids from Psidium guajava leaves.
abstract: Three pentacyclic triterpenoids including one new guajavanoic acid (2) and two known obtusinin (1) and goreishic acid I (3) have been isolated from the leaves of Psidium guajava. The new constituent 2 has been characterized as 2alpha-hydroxy-3beta-p-E-coumaroyloxyurs-12, 18-dien-28-oic acid through 1H-NMR and 13C-NMR (broad band and DEPT). This is the first report of isolation of compound 1 and 3 from the genus Psidium.
authors.affiliation: H.E.J. Research Institute of Chemistry, University of Karachi, Pakistan.
authors.forename: Sabira
authors.initials: S
authors.lastname: Begum
authors.forename: Bina S
authors.initials: BS
authors.lastname: Siddiqui
authors.forename: Syed Imran
authors.initials: SI
authors.lastname: Hassan
mesh_terms: D002855:Chromatography, Thin Layer; D008401:Gas Chromatography-Mass Spectrometry; D006868:Hydrolysis; D015394:Molecular Structure; D027822:Myrtaceae / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular; D010154:Pakistan; D053978:Pentacyclic Triterpenes; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D053978:Pentacyclic Triterpenes; D014315:Triterpenes; C459139:guajavanoic acid; C459140:obtusinin; C064858:goreishic acid I