title: [Cochinchinenin--a new chalcone dimer from the Chinese dragon blood].
abstract: OBJECTIVE
  To study the active constituents of Dracaena cochinchinensis (Lour.) S.C. Chen. in the commercial dragon blood.
  
  
  METHODS
  Various column chromatographies with Sephadex L-20 gel, MCI gel and silica gel were employed for the isolation and purification. The structures of compounds were elucidated by spectral analysis.
  
  
  RESULTS
  Nine chalcones were isolated from the commercial dragon's blood which was made of D. cochinchinensis (Lour.) S.C. Chen.. By means of spectral data, they were identified as 1-[5-(2,4,4'-trihydroxydihydrochalconyl)]-1- (p-hydroxyphenyl)-3-(2-methoxy-4-hydroxy-phenyl)-propane (1), 2'-methoxysocotrin-5'-ol (2), socotrin-4'-ol (3), 2-methoxy-4, 4'-dihydroxydihydrochalcone (4), 2, 4, 4'-trihydroxy-dihydrochalcone (5), 2, 4, 4'-trihydroxy-6-methoxydihydrochalcone (6), 2', 4', 4-trihydroxychalcone (7), 2-methoxy-4, 4'-dihydroxychalcone (8) and 2'-methoxy-4', 4-dihydroxychalcone (9).
  
  
  CONCLUSIONS
  Compound 1 is a new chalcone dimer and named as cochinchinenin. Compounds 2-9 were isolated from D. cochinchinensis (Lour.) S.C. Chen. for the first time.
authors.affiliation: Laboratory of Phytochemistry, Kunming Institute of Botany, Chinese Academy of Science, Kunming 650204, China. Zhouzh9@163.net
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhou
authors.forename: J L
authors.initials: JL
authors.lastname: Wang
authors.forename: C R
authors.initials: CR
authors.lastname: Yang
mesh_terms: D002599:Chalcone / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification*; D031409:Dracaena / Q000737:chemistry*; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: C475447:cochinchinenin; D002599:Chalcone