title: Sesquiterpene lactones and inositol esters from Arnica angustifolia.
abstract: From flowerheads of Arnica angustifolia ssp. attenuata nine helenanolides, two 1,5- trans-guaianolides, and a mixture of inositol-tetraesters were isolated. Five of the helenanolides are described for the first time. One of them, 4- O-tigloylarnicalpin, is the first 7(12),6-trans-lactonized pseudoguaianolide isolated from a natural source. The occurrence of inositol esters within the genus Arnica has not been reported before.
authors.affiliation: Institut für Pharmazeutische Biologie der Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany.
authors.forename: T J
authors.initials: TJ
authors.lastname: Schmidt
authors.forename: G
authors.initials: G
authors.lastname: Willuhn
authors.forename: A
authors.initials: A
authors.lastname: Steigel
authors.forename: D
authors.initials: D
authors.lastname: Wendisch