title: Four ent-kaurane-type diterpenoids from Croton tonkinensis Gagnep.
abstract: From the leaves of the endemic Vietnamese medicinal plant Croton tonkinensis GAGNEP. (Euphorbiaceae) the four new ent-kaurane-type diterpenoids ent-1alpha,14alpha-diacetoxy-7beta-hydroxykaur-16-en-15-one (1), ent-1alpha,7beta-diacetoxy-14alpha-hydroxykaur-16-en-15-one (2), ent-18-acetoxy-14alpha-hydroxykaur-16-en-15-one (3), and ent-(16S)-18-acetoxy-7beta-hydroxykauran-15-one (4) were isolated. Their structures were elucidated by spectroscopic analyses.
authors.affiliation: Faculty of Chemistry, College of Natural Science, Vietnam National University, Hanoi.
authors.forename: Phan Minh
authors.initials: PM
authors.lastname: Giang
authors.forename: Phan Tong
authors.initials: PT
authors.lastname: Son
authors.forename: Jung Joon
authors.initials: JJ
authors.lastname: Lee
authors.forename: Hideaki
authors.initials: H
authors.lastname: Otsuka
mesh_terms: D029802:Croton; D045786:Diterpenes, Kaurane / Q000737:chemistry* / Q000302:isolation & purification*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D018515:Plant Leaves
chemical_list: D045786:Diterpenes, Kaurane; D010936:Plant Extracts