title: Terpenoids from Euphorbia pekinensis.
abstract: Euphorpekone A (1) and euphorpekone B (2), two new diterpenoids, 3β-hydroxy-25-methyloxylanosta-8,23-diene, a new triterpenoid (3), together with a known triterpenoid, 3β,25-dihydroxylanosta-8,23-diene (4), were isolated from Euphorbia pekinensis Rupr. Their structures were elucidated on the basis of UV, IR, 1D ((1)H, (13)C, NOE) and 2D ((1)H-(1)H COSY, HSQC, HMBC) NMR, HR-ESI-MS, X-ray diffraction analysis, and CD method.
authors.affiliation: a State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , China.
authors.forename: Fu-Hu
authors.initials: FH
authors.lastname: Fang
authors.affiliation: a State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , China.
authors.forename: Wen-Hai
authors.initials: WH
authors.lastname: Li
authors.affiliation: a State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , China.
authors.forename: Zheng-Zhi
authors.initials: ZZ
authors.lastname: Han
authors.affiliation: a State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , China.
authors.forename: Wen-Jun
authors.initials: WJ
authors.lastname: Huang
authors.affiliation: a State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , China.
authors.forename: Dong-Xu
authors.initials: DX
authors.lastname: Li
authors.affiliation: a State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , China.
authors.forename: Sha
authors.initials: S
authors.lastname: Zhao
authors.affiliation: a State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , China.
authors.forename: Min-Hao
authors.initials: MH
authors.lastname: Tang
authors.affiliation: a State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , China.
authors.forename: Cheng-Shan
authors.initials: CS
authors.lastname: Yuan
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D028481:Euphorbia / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: C000607680:3beta-hydroxy-25-methyloxylanosta-8,23-diene; D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; D014315:Triterpenes; C000607678:euphorpekone A; C000607679:euphorpekone B
keywords: Euphorbia pekinensis; Euphorbiaceae; diterpenoid; triterpenoid