The epigeal part of Delphinium corumbosum Rgl., collected in the flowering phase in the environs of Pokatilovka (Dzhungarian Ala-Tau) has yielded - in addition to the known alkaloids methyllycaconitine, lycoctonine, delcorine, deoxydelcorine, delcoridine, dehydrodelcorine, dephatine, browniine, dictysine, and dictysine acetonide - a new diterpene alkaloid with the composition C25H39NO6 (I), which has been called corumdephine. The structure of corumdephine has been established on the basis of a passage from (I) to deoxydelcorine and spectral characteristics. © 1985 Plenum Publishing Corporation.