title: [A-ring formylated flavonoids and oxoaporphinoid alkaloid from Dasymaschalon rostratum Merr. et Chun].
abstract: OBJECTIVE
  To study the chemical components in the stem of Dasymaschalon rostratum.
  
  
  METHODS
  The components were extracted with solvent, separated and purified with chromatographic methods, identified by NMR, MS, UV, IR and physicol-chemical constants.
  
  
  RESULTS
  Three A-ring-formylated flavonoids and one oxoaporphinnoid aikaloid were isolated and identified as lawinal, unonal, isounonal and 7-oxodehydroasimilobine.
  
  
  CONCLUSIONS
  All the four compounds were isolated for the first time from the genus Dasymaschalon. According to all the phytochemistry papers on Annonaceae, A-ring formylated flavonoids in this family were isolated from the genus Desmos for the first time. Thus, it is an interesting discovery in chemotaxonomy which reveals the close relationship between the two genera Desmos and Dasymaschalon.
authors.affiliation: Institute of Medicinal Plants, CAMS & PUMC, Beijing 100094, China.
authors.forename: L D
authors.initials: LD
authors.lastname: Zhou
authors.forename: J G
authors.initials: JG
authors.lastname: Yu
authors.forename: J
authors.initials: J
authors.lastname: Guo
authors.forename: S L
authors.initials: SL
authors.lastname: Yang
mesh_terms: D029061:Annonaceae / Q000737:chemistry* / Q000145:classification; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry* / Q000145:classification; D011166:Porphyrins / Q000737:chemistry / Q000302:isolation & purification
chemical_list: C471769:7-oxodehydroasimilobine; D004365:Drugs, Chinese Herbal; D005419:Flavonoids; D011166:Porphyrins; C061398:lawinal; C061424:isounonal; C471768:unonal