title: Biflavonoids from Lonicera japonica.
abstract: Two biflavonoids, 3'-O-methyl loniflavone [5,5'',7,7''-tetrahydroxy 3'-methoxy 4',4'''-biflavonyl ether (1)] and loniflavone [5,5'',7,7'',3'-pentahydroxy 4',4'''-biflavonyl ether (2)] along with luteolin (3) and chrysin (4) were isolated from the leaves of Lonicera japonica. The structures were established on the basis of UV/vis, 1D, 2D NMR (HMQC and HMBC) and ESI-QTOF-MS/MS spectroscopic methods and chemical evidences.
authors.affiliation: Natural Plant Products Division, Institute of Himalayan Bioresource Technology, Palampur, HP 176 061, India.
authors.forename: Neeraj
authors.initials: N
authors.lastname: Kumar
authors.forename: Bikram
authors.initials: B
authors.lastname: Singh
authors.forename: Pamita
authors.initials: P
authors.lastname: Bhandari
authors.forename: Ajai P
authors.initials: AP
authors.lastname: Gupta
authors.forename: Sanjay K
authors.initials: SK
authors.lastname: Uniyal
authors.forename: Vijay K
authors.initials: VK
authors.lastname: Kaul
mesh_terms: D044946:Biflavonoids / Q000737:chemistry* / Q000302:isolation & purification; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification; D031239:Lonicera / Q000737:chemistry*; D047311:Luteolin / Q000737:chemistry / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D044946:Biflavonoids; D005419:Flavonoids; C043561:chrysin; D047311:Luteolin