title: Two new triterpenoids from the fresh leaves of Psidium guajava.
abstract: Two new triterpenoids, guajavolide (2 alpha,3 beta,6 beta,23-tetrahydroxyurs-12-en-28,20 beta-olide; 1) and guavenoic acid (2 alpha,3 beta,6 beta,23-tetrahydroxyurs-12,20(30)-dien-28-oic acid; 2) along with one known triterpene oleanolic acid (3) were isolated from the fresh leaves of Psidium guajava. Their structure elucidation and stereochemistry were determined by spectroscopic experiments, including 2D-NMR techniques.
authors.affiliation: H. E. J. Research Institute of Chemistry, International Centre for Chemical Sciences, University of Karachi, Pakistan. sabira@khi.comsats.net.pk
authors.forename: Sabira
authors.initials: S
authors.lastname: Begum
authors.forename: Syed Imran
authors.initials: SI
authors.lastname: Hassan
authors.forename: Bina S
authors.initials: BS
authors.lastname: Siddiqui
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009828:Oleanolic Acid / Q000737:chemistry / Q000302:isolation & purification; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry; D031647:Psidium; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D010936:Plant Extracts; D014315:Triterpenes; C472162:guajavolide; C472163:guavenoic acid; D009828:Oleanolic Acid