| Abstract: | Summary The mass spectra of the sesquiterpene lactone germanin-A and 11 of its derivatives and deuterium analogs have been studied. A scheme has been put forward for the decomposition of germanin-A under the action of electron impact. It has been established that the elimination of a molecule of acid from position 8 in the dissociative ionization of germanin-A and of tetrahydrogermanin-A involves the hydrogen atom of the carboxy group present in position 10 of the sesquiterpene ring. On this basis, a suggested conformation of the germanin-A molecule has been put forward.M. V. Lomonosov Moscow State University. All-Union Scientific-Research Institute of Medicinal Plants, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 337–345, May–June, 1978. |
