New diterpene lactones fromEuphorbia pallasii

Three new diterpene lactones have been isolated from a chloroform extract of the roots ofEuphorbia pallasii: pseudojolkinolide A psuedojolkinolide B, and 16-hydroxypseudojolkinolide B. Structures have been proposed for them on the basis of chemical transformations and IR, UV,¹³C and¹H NMR, and mass spectra.Irkutsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 337–345, May–June, 1985.