title: Two new coumarin derivatives from the roots of Heracleum rapula.
abstract: Two new coumarins, 13- O-[ beta- D-apiofuranosyl(1-->6)- beta- D-glucopyranosyl]-(12 R)-heraclenol ( 1) and (12 R,12" R)-diheraclenol ( 2) were isolated from the acetone extract of the fresh roots of Heracleum rapula. Their structures were determined by means of spectroscopic analysis and, in the case of compound 1, the structure elucidation was supported by acid hydrolysis. Compound 1 is a coumarin glycoside while 2 is a coumarin dimer. The inhibitory effects of 1, its aglycone ( 3), and 2 on rabbit platelet aggregation induced by PAF, AA and ADP were tested. Weak activities were observed for each compound with the percentages of inhibition in the range of 0.7 - 24.8 %.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, The Chinese Academy of Sciences, Kunming, Yunnan, P. R. China.
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Niu
authors.forename: Sheng-Hong
authors.initials: SH
authors.lastname: Li
authors.forename: Li-Xin
authors.initials: LX
authors.lastname: Wu
authors.forename: Ling
authors.initials: L
authors.lastname: Li
authors.forename: Li-Hui
authors.initials: LH
authors.lastname: Gao
authors.forename: Han-Dong
authors.initials: HD
authors.lastname: Sun
mesh_terms: D000818:Animals; D003374:Coumarins / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D030002:Heracleum; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D018517:Plant Roots; D010974:Platelet Aggregation / Q000187:drug effects*; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D011817:Rabbits
chemical_list: D003374:Coumarins; D010936:Plant Extracts; D010975:Platelet Aggregation Inhibitors