title: A new biflavonoid from Aristolochia contorta.
abstract: From the fruits of Aristolochia contorta Bge, beside the known aristolochic acids IVa and VII, aristolactam-N-beta-D-glucopyanoside, aristoloctam Ia N-beta-D-glucopyanoside, pinitol and daucosterol, a new biflavonoid was isolated. Its structure was determined as (+/-)-2"R,3"R-dihydro-3"-hydroxyamentoflavone (1) by means of spectral methods including 1D-, 2D-NMR and HR-ESIMS and the known compounds were identified on the basis of comparing their NMR data with those of the corresponding compounds in the literature.
authors.affiliation: Department of Chemistry, Yunnan Normal University, PR China.
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Yu
authors.forename: Rong
authors.initials: R
authors.lastname: Huang
authors.forename: Yu-Ping
authors.initials: YP
authors.lastname: Lv
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yegao
authors.initials: Y
authors.lastname: Chen
mesh_terms: D030022:Aristolochia / Q000737:chemistry*; D044946:Biflavonoids / Q000737:chemistry* / Q000302:isolation & purification; D005638:Fruit / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: C505884:2''R,3''R-dihydro-3''-hydroxyamentoflavone; D044946:Biflavonoids; D010936:Plant Extracts