title: [Studies on chemical constituents from roots of Pterospermum heterophyllum].
abstract: OBJECTIVE
  To study the chemical constituents from the roots of Pterospermum heterophyllum.
  
  
  METHODS
  The chemical constituents of P. heterophyllum were isolated and purified by silica gel and sephadex LH-20 column chromatography. Their structures were identified on the basis of spectroscopic data and physicochemical properties.
  
  
  RESULTS
  Nine compounds were isolated and identified as taraxerol (1), betulin (2), betulinic acid (3), sumaresinolic acid (4), 2-methoxy-5-hydroxy-1, 4-naphthoquinone (5), 5, 7-dihydroxy-6, 8-dimethylchromone (6), alpha-monpalmitin (7), palmitic acid (8), beta-sitosterol (9).
  
  
  CONCLUSIONS
  Compounds 2-7 were isolated from this genus for the first time.
authors.affiliation: Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Shi
authors.forename: Shuai
authors.initials: S
authors.lastname: Li
authors.forename: Hong-yu
authors.initials: HY
authors.lastname: Li
authors.forename: Bao-song
authors.initials: BS
authors.lastname: Cui
authors.forename: Yi
authors.initials: Y
authors.lastname: Yuan
mesh_terms: D002845:Chromatography; D019660:Malvaceae / Q000737:chemistry*; D009285:Naphthoquinones / Q000737:chemistry; D009828:Oleanolic Acid / Q000031:analogs & derivatives / Q000737:chemistry; D019308:Palmitic Acid / Q000737:chemistry; D053978:Pentacyclic Triterpenes; D018517:Plant Roots / Q000737:chemistry*; D012855:Sitosterols / Q000737:chemistry; D014315:Triterpenes / Q000737:chemistry; D000094062:Betulinic Acid
chemical_list: D009285:Naphthoquinones; D053978:Pentacyclic Triterpenes; D012855:Sitosterols; D014315:Triterpenes; D019308:Palmitic Acid; C025473:gamma-sitosterol; D009828:Oleanolic Acid; C002503:betulin; C005802:taraxerol; D000094062:Betulinic Acid