title: Sesquiterpene lactones from Achillea collina J. Becker ex Reichenb.
abstract: The flower heads of Achillea collina afforded 31 individual sesquiterpene lactones, among which nine guaianolides (1, 16, 20, 21, 23, 27-30), a germacranolide (18) and a dimeric guaianolide (31) were found to be new natural products. The lactones 2-4, 12, 14, 15, 17, 19 and 25 were isolated for the first time from the investigated species. Their structures were established by spectral methods.
authors.affiliation: Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia. trendaf@orgchm.bas.bg
authors.forename: Antoaneta
authors.initials: A
authors.lastname: Trendafilova
authors.forename: Milka
authors.initials: M
authors.lastname: Todorova
authors.forename: Bozhanka
authors.initials: B
authors.lastname: Mikhova
authors.forename: Antonina
authors.initials: A
authors.lastname: Vitkova
authors.forename: Helmut
authors.initials: H
authors.lastname: Duddeck
mesh_terms: D031162:Achillea / Q000737:chemistry*; D035264:Flowers / Q000737:chemistry*; D007783:Lactones / Q000737:chemistry*; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry; D012717:Sesquiterpenes / Q000737:chemistry*; D045789:Sesquiterpenes, Guaiane / Q000737:chemistry
chemical_list: D007783:Lactones; D010936:Plant Extracts; D012717:Sesquiterpenes; D045789:Sesquiterpenes, Guaiane