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The fundamental study of the biogenetic origin of natural products has always been limited from the experimental point of view… Expand Four sesquiterpene lactones of the pseudo‐guaianolide type (helenalin, dihydrohelenalin and their acetates), have shown… Expand ConclusionsIt has been shown that the dehydration of the sesquiterpene lactone coronopilin with SOCl2 forms Δ1(2… Expand The pseudoguaianolide inuchinenolide C and the eudesmanolide pulchellin C have been isolated for the first time from the flower… Expand i. K.S. Rybalko, Natural Sesquiterpene Lactones [in Russian], Moscow (1978), p. 320. 2. N.H. Fischer, E. J. Oliver, and H. D… Expand A novel sesquiterpenoid, charminarone, the first seco-pseudoguaianolide, has been isolated along with several known compounds… Expand From flowerheads of Arnica angustifolia ssp. attenuata nine helenanolides, two 1,5- trans-guaianolides, and a mixture of inositol… Expand The antitumor pseudoguaianolide tenulin has been exposed to a wide variety of biological and model nucleophilic reagents and has… Expand The desert-marigold Baileya multiradiata Harv. and Gray (Compositae) has been found to produce a series of sesquiterpenes that… Expand