title: Triterpenoids from the bark of Ruptiliocarpon caracolito.
abstract: Five spirocaracolitone triterpenoids were isolated from the dichloromethane-soluble fraction of the bark of Ruptiliocarpon caracolito, and their structures were determined mainly by application of 1D and 2D NMR spectroscopy. Two known CD-spirotriterpenoids were also isolated from the same source. This brings the total number of known CD-spirotriterpenoids from this source to 17. The discovery of such a large number of closely-related compounds in a single species represents an excellent example of phytochemical redundancy as a defense mechanism.
authors.affiliation: Department of Chemistry, 10 Marie-Curie, Ottawa, ON, Canada K1N 6N5.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Asim
authors.forename: Helmi
authors.initials: H
authors.lastname: Hussien
authors.forename: Luis
authors.initials: L
authors.lastname: Poveda
authors.forename: John Thor
authors.initials: JT
authors.lastname: Arnason
authors.forename: Tony
authors.initials: T
authors.lastname: Durst
mesh_terms: D029753:Celastraceae / Q000737:chemistry*; D003364:Costa Rica; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D024301:Plant Bark / Q000737:chemistry; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D014315:Triterpenes