title: Taibaijaponicains C and D: two new diterpenoids from Isodon japonica.
abstract: Two new C-20-oxygenated ent-kaurene diterpenoids, taibaijaponicains C and D, together with five known compounds, were isolated from the ethanol extract of the leaves and branches of Isodon japonica (Burm. f.) Hara. The structures of new compounds were elucidated as 1 alpha-aectoxy-7 beta,12 beta,15 alpha-trihydroxy-16 alpha-hydroxymethyl-7,20-epoxy- ent-kaurane and 1 alpha-acetoxy-2 beta,3 alpha,6 beta,7 beta,12 beta-pentahydroxy-7,20;19,20-diepoxy- ent-kaur-16-en-15-one, respectively, on the basis of detailed spectroscopic analysis.
authors.affiliation: School of Chemistry and Material Science, Shaanxi Normal University, Xi'an, Shaanxi 710062, China. baolinli@snnu.edu.cn
authors.forename: Bao Lin
authors.initials: BL
authors.lastname: Li
mesh_terms: D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D045786:Diterpenes, Kaurane; D004365:Drugs, Chinese Herbal; D019686:Lamiaceae; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D018520:Plant Shoots / Q000737:chemistry
chemical_list: D004224:Diterpenes; D045786:Diterpenes, Kaurane; D004365:Drugs, Chinese Herbal; D010936:Plant Extracts; C462038:taibaijaponicain C; C462039:taibaijaponicain D; C011959:oridonin; C037017:rabdosin A