title: Ent-3,4-seco-labdane and ent-labdane diterpenoids from Croton stipuliformis (Euphorbiaceae).
abstract: From a methanolic extract of the leaves of Croton stipuliformis, three ent-3,4-seco-labdanes (1-3) and an ent-labdane (4) together with the known compounds 6-hydroxynidorellol (5), maravuic acid, and sitosterol were isolated and identified from their spectroscopic data. The absolute stereochemistry of compound 4 was determined by application of Mosher's method in the NMR tube.
authors.affiliation: Graduate School of Pharmaceutical Sciences, University of Tokushima, Shomachi 1-78, Tokushima 770-8505, Japan. faramosr@unal.edu.co
authors.forename: Freddy
authors.initials: F
authors.lastname: Ramos
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Takaishi
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Kashiwada
authors.forename: Coralia
authors.initials: C
authors.lastname: Osorio
authors.forename: Carmenza
authors.initials: C
authors.lastname: Duque
authors.forename: Ricardo
authors.initials: R
authors.lastname: Acuña
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Fujimoto
mesh_terms: D029802:Croton / Q000737:chemistry*; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D008958:Models, Molecular; D018515:Plant Leaves / Q000737:chemistry; D013729:Terpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D004224:Diterpenes; D013729:Terpenes; C433017:labdane