title: [Studies on liposoluble constituents from the aerial parts of Siegesbeckia orientalis L].
abstract: Eight compounds were isolated from the aerial parts of Siegesbeckia orientalis L. and their structures were elucidated by spectroscopic methods(IR, EI-MS, 13C-NMR, 1H-NMR, 1H-1H COSY, 1H-1H NOESY and 1H-13C COSY). Compounds I and II are new natural products and named siegesesteric acid(I) and siegesetheric acid(II), their structures were confirmed as ent-17-acetoxy-18-isobutyryloxy-16(alpha)-kauran-19-oic acid(I) and ent-17-ethoxy-16(alpha)-(-)-kauran-19-oic acid(II). The others were identified as known compounds: ent-16 beta, 17-dihydroxy-kauran-19-oic acid (III), kirenol(IV), beta-sitosteryl glucoside(V), heneicosanol(VI), methyl arachidate(VII) and beta-sitosterol(VIII). These compounds, except kirenol and beta-sitosterol, were isolated for the first time from the title plant.
authors.affiliation: School of Pharmaceutical Sciences, Beijing Medical University, Beijing 100083.
authors.forename: D A
authors.initials: DA
authors.lastname: Guo
authors.forename: Z G
authors.initials: ZG
authors.lastname: Zhang
authors.forename: G Q
authors.initials: GQ
authors.lastname: Ye
authors.forename: Z C
authors.initials: ZC
authors.lastname: Lou
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification*; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D005663:Furans / Q000737:chemistry / Q000302:isolation & purification*; D007783:Lactones / Q000737:chemistry / Q000302:isolation & purification*; D019684:Magnoliopsida / Q000737:chemistry; D008968:Molecular Conformation; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; D005663:Furans; D007783:Lactones; C560087:kirenol; C437399:siegesesteric acid; C437400:siegesetheric acid; C118092:uvarigrin