title: Chemical constituents of Tolpis species.
abstract: Phytochemical research of two Tolpis species, T. webbii and T. sp., led to the isolation of three new compounds: 2,4'-dihydroxy-4-methoxybenzophenone (1) and the triterpenes 21 alpha, 22 alpha-epoxy-20 alpha-hydroxy-20(30)-dihydrotaraxasterol (2) and 3beta-hydroxytaraxaster-20-en-30-oic acid (3) together with 16 known compounds. The structures of the new compounds were elucidated by means of extensive IR, NMR, MS and X-ray analysis and by comparison of data reported in the literature.
authors.affiliation: Departamento de Química, Universidad de Las Palmas de Gran Canaria, Campus de Tafira, 35017, Las Palmas de Gran Canaria, Gran Canaria, Canary Islands, Spain.
authors.forename: Jorge
authors.initials: J
authors.lastname: Triana
authors.forename: Mariana
authors.initials: M
authors.lastname: López
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Pérez
authors.forename: Javier González
authors.initials: JG
authors.lastname: Platas
authors.forename: Francisco
authors.initials: F
authors.lastname: Estévez
authors.forename: Juan Francisco
authors.initials: JF
authors.lastname: León
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Hernández
authors.forename: Ignacio
authors.initials: I
authors.lastname: Brouard
authors.forename: Jaime
authors.initials: J
authors.lastname: Bermejo
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D001577:Benzophenones / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D035261:Plant Components, Aerial; D010936:Plant Extracts / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C544793:2,4'-dihydroxy-4-methoxybenzophenone; C544794:21 alpha, 22 alpha-epoxy-20 alpha-hydroxy-20(30)-dihydrotaraxasterol; C544795:3beta-hydroxytaraxaster-20-en-30-oic acid; D001577:Benzophenones; D010936:Plant Extracts; D014315:Triterpenes