title: Two new guaianolides from Amberboa ramosa.
abstract: Two new sesquiterpene lactones named amberbins A (1) and B (2), have been isolated from the ethyl acetate soluble fraction of Amberboa ramosa, together with jaseocidine (3), crysoeriol (4) and 3beta,8alpha-dihydroxy-11alpha-methyl-1alphaH,5alphaH,6betaH, 7alphaH,11betaH-guai-10(14), 4(15)-dien-6,12-olide (5). The structures of the isolated compounds have been elucidated on the basis of their spectroscopic data.
authors.affiliation: International Centre for Chemical and Biological Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Ibrahim
authors.forename: Rehan
authors.initials: R
authors.lastname: Khan
authors.forename: Abdul
authors.initials: A
authors.lastname: Malik
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D045789:Sesquiterpenes, Guaiane / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D045789:Sesquiterpenes, Guaiane; C556277:amberbin A; C556278:amberbin B