title: Cucurbitacins from Cayaponia racemosa: isolation and total assignment of 1H and 13C NMR spectra.
abstract: Two new cucurbitane-type triterpenoids, 2beta,3beta,16alpha,20(R),25-pentahydroxy-9-methyl-19-norlanost-5-en-7,22-dione and 2beta,3beta,16alpha,20(R),25-pentahydroxy-9-methyl-19-norlanost-5-en-7,11,22-trione, were isolated from fruits of Cayaponia racemosa. The total (1)H and (13)C chemical shift assignment of these two closely related compounds is described, making use of one- and two-dimensional NMR techniques.
authors: Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, CEP: 60.45170 Fortaleza, Ceará, Brazil.
authors: Davina C
authors: DC
authors: Chaves
authors: João Carlos C
authors: JC
authors: Assunção
authors: Raimundo
authors: R
authors: Braz-Filho
authors: Telma L G
authors: TL
authors: Lemos
authors: Francisco J Q
authors: FJ
authors: Monte
mesh_terms: D002247:Carbon Isotopes; D019662:Cucurbitaceae / Q000737:chemistry*; D054728:Cucurbitacins; D005638:Fruit / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011522:Protons; D014315:Triterpenes / Q000737:chemistry*
chemical_list: C521453:2,3,16,20,25-pentahydroxy-9-methyl-19-norlanost-5-en-7,11,22-trione; C521452:2,3,16,20,25-pentahydroxy-9-methyl-19-norlanost-5-en-7,22-dione; D002247:Carbon Isotopes; D011522:Protons; D014315:Triterpenes; D054728:Cucurbitacins