1. Sevkorine, korseveriline, severtzidine, and the new alkaloid korsidine have been isolated from the combined alkaloids of the epigeal part of Korolkovia severtzovii Rgl. 2. On the basis of a study of the chemical and physical properties of the alkaloid itself and the products of its transformation, and also its conversion into the known alkaloid petilininedione the structure and configuration of korsidine have been established as 3α,6β-dihydroxy-Δ8-cevanene. © 1977 Plenum Publishing Corporation.