From the epigeal part of Korolkowia sewerzowii collected in Katrantau have been isolated a base with mp 200-202°C and the new alkaloid seveline the structure and configuration of which has been established on the basis of a study of IR, NMR, and mass spectra and its transformation products as 3α-20β-dihydroxycevanin-6-one. © 1980 Plenum Publishing Corporation.