Mariolin,a germacranolide from Anacyclus radiatus

A new sesquiterpene lactone, the germacranolide mariolin, was isolated from the aerial part of Anacyclus radiatus along with several known compounds. The structure of mariolin was determined by spectroscopic methods.     

Marginatin,a new germacranolide from Vernonia species

A new germacranolide, marginatin, has been isolated from three species of Vernonia from the central United States, V. marginata, V. fasciculata and V. arkansana, and its structure has been determined.     

A germacranolide from Inula indica

Chemical investigation of Inula indica has yielded a new germacranolide, 1β,10α-epoxy-2α,9β-dihydroxy-5β-acetoxy-6α(2-methylbutyryloxy)-germacran-8α,12-olide, whose structure and stereochemistry have been established from the spectral characteristics of the compound and its derivatives.     

Four guaianolides,a eudesmanolide and a germacranolide from Ursinia saxatilis

An investigation of Ursinia saxatilis afforded in addition to known compounds a new eudesmanolide derived from ursialpinolide, a germacranolide rel     

9α,15-Dihydroxygermacra-1(10),4-dien-11β,13-dihydro-6α,12-olide,a germacranolide isolated from Centaurea aspera subsp. stenophylla

A new germacranolide, isolated from Centaurea aspera subsp. stenophylla, was identified as 9β,15-dihydroxygermacra-1 (10)4-dien-11β,l3-dihydro-6α,12-olide by spectroscopic evidence and partial synthesis.     

Novanin: A germacranolide from Artemisia nova

A new germacranolide, novanin (I), has been isolated from Artemisia nova and its structure determined. The compound is also present in small amount in A. tripartite Rydb. ssp. rupicola Beetle.     

A germacranolide and a longipinene derivative from Eupatoriadelphus purpureus

The roots of Eupatoriadelphus purpureus contain tridecapentaynene, β-pinene and five p-hydroxyaecetophenone derivatives. By contrast, the aerial parts have germacrene D, lupeol and its isomers, coumarin, a new sesquiterpene tiglate and a new germacranolide.     

Viguilenin,a germacranolide from Viguiera linearis

The new germacranolide, viguilenin, was isolated from Viguiera linearis and its structure was established by chemical and spectroscopic means.     

Isocentratherin,a cytotoxic germacranolide from Centratherum punctatum (compositae)

A cytotoxic germacranolide, isocentratherin, has been isolated from the aerial parts of Centratherum punctatum (Compositae).     

A dimeric germacranolide and other sesquiterpene lactones from Mikania species

The investigation of two Mikania species, both previously placed in the genus Kanimia, afforded in addition to known compounds several new germ     

Annuithrin,a new biologically active germacranolide from Helianthus annuus

Investigations on growth inhibition in Helianthus annuus led to the isolation of a new sesquiterpene lactone, a germacranolide with an α-methylene-γ-lactone moiety. The structure of this new germacranolide, annuithrin, was elucidated by spectroscopic methods. Its biological activity has been proven by growth inhibition in straight growth tests, antibacterial tests and inhibition of DNA-/RNA-synthesis in cells of the ascitic form of Ehrlich carcinoma.     

Confertdiolide,a novel sesquiterpenoid lactone from Parthenium

Four sesquiterpene lactones were isolated from several populations of Parthenium confertum var. lyratum (Gray) collected in Sierra de Arteaga, southern Coahuila. Three of the compounds, hysterin, tetraneurin E and hymenin were previously isolated from other Parthenium species. The fourth constituent is the new cyclopropanoid sesquiterpene dilactone confertdiolide which represents a new structural type. The photolytic conversion of hymenin into confertdiolide confirmed its structure.     

Furanoheliangolides from two Eremanthus species and from Chresta sphaerocephala

The investigation of Eremanthus crotonoides afforded in addition to known compounds three new furanoheliangolides, while from E. glomerulatus six new furanoheliangolides and eremantholides were isolated. From the aerial parts of Chresta sphaerocephala a new guaianolide was obtained, while the roots contained known furanoheliangolides. The chemotaxonomy of the subtribe Lychnophorinae is discussed briefly.     

Sesquiterpene lactones from Podanthus ovatifolius

The title plant has been shown to contain the sesquiterpene lactones erioflorin methacrylate (I), erioflorin (III), erioflorin acetate (VIII) and a new lactone, ovatifolin (X).     

Sesquiterpene lactones from Viguiera species

Viguiera eriophora yielded the sesquiterpene lactones erioflorin, acetylerioflorin and 17,18-dehydroviguiepinin, which was correlated with tetrahyd