title: A new bibenzyl from Dendrobium secundum.
abstract: From the aerial parts of Dendrobium secundum, a new bibenzyl, namely 4,5,4'-trihydroxy-3,3'-dimethoxybibenzyl, was isolated, along with four known compounds which included brittonin A, moscatilin, syringaresinol, and ferulic acid. All of these isolates showed appreciable DPPH free radical scavenging potential, except for brittonin A, which was devoid of activity.
authors.affiliation: Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: Boonchoo
authors.initials: B
authors.lastname: Sritularak
authors.forename: Natthacha
authors.initials: N
authors.lastname: Duangrak
authors.forename: Kittisak
authors.initials: K
authors.lastname: Likhitwitayawuid
mesh_terms: D001632:Bibenzyls / Q000302:isolation & purification* / Q000494:pharmacology; D001713:Biphenyl Compounds / Q000737:chemistry; D031667:Dendrobium / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000302:isolation & purification / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D010851:Picrates / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001632:Bibenzyls; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D010851:Picrates; C004931:1,1-diphenyl-2-picrylhydrazyl