title: Two New Eremophilane Sesquiterpenes and One New Resorcinol from Ligularia knorringiana.
abstract: Two new eremophilane sesquiterpenes, 12-oxa-1β, 5β,8,9aβ-tetramethyl-4α,5-ethano-4aβ-hydroxy-7β,10aβ-epoxy-9β-angeloyloxy-1,2,3,4,4a,5,6,7,9,9a,10,10a- dodecahydro-anthracen-13-on (knorringianalarin A, 1) and 6,9-dien-8-oxoeremophil-12-nor-11-ketone (knorringianalarin B, 2), and a new resorcinol, 4-acetyl- 6-(2-methylpropionyl)-1,3-resorcinol (knorringianalarin C, 3) were isolated from the roots and rhizomes of Ligularia knorringiana, together with three known eremophilane sesquiterpenes (4-6). The structures of the new compounds were identified by spectroscopic methods including 2D-NMR techniques.
authors.forename: Wei
authors.initials: W
authors.lastname: Dai
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Wenli
authors.initials: W
authors.lastname: Cong
authors.forename: Wenbin
authors.initials: W
authors.lastname: Zhao
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D015394:Molecular Structure; D000081223:Polycyclic Sesquiterpenes; D012118:Resorcinols / Q000737:chemistry*; D012717:Sesquiterpenes / Q000737:chemistry*
chemical_list: D000081223:Polycyclic Sesquiterpenes; D012118:Resorcinols; D012717:Sesquiterpenes; C018286:eremophilane compounds; C000607049:knorringianalarin A; C000607050:knorringianalarin B; C000607051:knorringianalarin C