title: One new diphenylmethane glycoside from the leaves of Psidium guajava L.
abstract: To investigate the chemical constituents of Psidium guajava L, the EtOH/H(2)O extract of the fresh leaves was subjected to various chromatography. One diphenylmethane, one benzophenone, and eight flavonoids were isolated and elucidated as 2,6-dihydroxy-3-formaldehyde-5-methyl-4-O-(6″-O-galloyl-β-D-glucopyranosyl)-diphenylmethane (1), 2,6-dihydroxy-3,5-dimethyl-4-O-(6″-O-galloyl-β-D-glucopyranosyl)-benzophenone (2), kaempferol (3), quercetin (4), quercitrin (5), isoquercitrin (6), guaijaverin (7), avicularin (8), hyperoside (9), reynoutrin (10) by spectroscopic methods, including 1D and 2D NMR and HR-ESI-MS spectrometry as well as by comparison with published data. Compounds 5 and 10 are obtained from P. guajava for the first time, and compound 1 is a new diphenylmethane compound.
authors.affiliation: MOE Key Laboratory for Standardization of Chinese Medicines and SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica of Shanghai University of Traditional Chinese Medicine, Cai Lun Road 1200, Zhangjiang, Shanghai, China.
authors.forename: Ji-Cheng
authors.initials: JC
authors.lastname: Shu
authors.forename: Gui-Xin
authors.initials: GX
authors.lastname: Chou
authors.forename: Zheng-Tao
authors.initials: ZT
authors.lastname: Wang
mesh_terms: D001559:Benzhydryl Compounds / Q000737:chemistry / Q000302:isolation & purification; D001577:Benzophenones / Q000737:chemistry; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification; D005707:Gallic Acid / Q000031:analogs & derivatives / Q000737:chemistry; D005960:Glucosides / Q000737:chemistry; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry*; D031647:Psidium / Q000737:chemistry*; D011794:Quercetin / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: C000590672:2,6-dihydroxy-3,5-dimethyl-4-O-(6'-O-galloyl-beta-D-glucopyranosyl)-benzophenone; C000590671:2,6-dihydroxy-3-formaldehyde-5-methyl-4-O-(6'-O-galloyl-beta-D-glucopyranosyl)-diphenylmethane; D001559:Benzhydryl Compounds; D001577:Benzophenones; D005419:Flavonoids; D005960:Glucosides; D006027:Glycosides; C519462:guaijaverin; C016527:isoquercitrin; C012526:quercitrin; C041388:avicularin; D005707:Gallic Acid; C021304:hyperoside; D011794:Quercetin; C010129:diphenylmethane