title: [Terpenoids from leaves of Aeschynanthus mengxinensis].
abstract: OBJECTIVE
  To study the chemical constituents from the ethyl acetate portion of an ethanolic extractive of the leaves of Aeschynanthus mengxinensis.
  
  
  METHODS
  The column chromatographic techniques were applied to isolate constituents. A combination of IR, ESI-MS, NMR and 2D-NMR spectroscopy was used to identify structures.
  
  
  RESULTS
  Four compounds were isolated from the ethyl acetate fraction of this plant, and the structure of them have identified as 2alpha, 3beta, 19beta-trihydroxyolean-12-ene-23,28-dioic acid (1), 2alpha, 3beta, 21beta-trihydroxyolean-12-ene-28-oic acid (2), 2alpha, 3beta, 23-trihydroxyurs-12-ene-28-oic acid (3) and stigmast-5 (6), 22 (23)-diene-3beta-ol (4).
  
  
  CONCLUSIONS
  The NMR data of compound 1 was completely assigned by 2D-NMR techniques, including HMBC and HMQC. Compounds 1-4 were isolated for the first time from Gesneriaceae.
authors.affiliation: Institute of Natural Products, Henan University, Kaifeng 475004, China. kangweny@hotmail.com
authors.forename: Wen-yi
authors.initials: WY
authors.lastname: Kang
authors.forename: Xin-yan
authors.initials: XY
authors.lastname: Zang
authors.forename: Jin-mei
authors.initials: JM
authors.lastname: Wang
authors.forename: Qi-tai
authors.initials: QT
authors.lastname: Xu
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry; D019684:Magnoliopsida / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D013729:Terpenes / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal; D013729:Terpenes