title: Four new bibenzyl derivatives from Dendrobium candidum.
abstract: Four new bibenzyl derivatives, namely, dendrocandins F-I (1-4), were isolated from the stems of Dendrobium candidum. Their structures were elucidated by the analysis of spectroscopic data. Dendrocandins F and G represent the fourth and fifth example of bisbibenzyl derivates with a dibenzopyran ring between two units, respectively. Dendrocandin H represents the first example of a bibenzyl derivative formed by a bibenzyl and a 1,4-phenanthraquinone unit via a dibenzopyran ring. Compounds 1-4 were examined for antioxidant activity by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging assay.
authors.affiliation: Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Chun-Lan
authors.initials: CL
authors.lastname: Wang
authors.forename: Ya-Jun
authors.initials: YJ
authors.lastname: Wang
authors.forename: Fang-Fei
authors.initials: FF
authors.lastname: Wang
authors.forename: Shun-Xing
authors.initials: SX
authors.lastname: Guo
authors.forename: Jun-Shan
authors.initials: JS
authors.lastname: Yang
authors.forename: Pei-Gen
authors.initials: PG
authors.lastname: Xiao
mesh_terms: D001632:Bibenzyls / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D002942:Circular Dichroism; D031667:Dendrobium / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D018547:Plant Stems / Q000737:chemistry
chemical_list: D001632:Bibenzyls; D016166:Free Radical Scavengers