Delphinium vestitum Wall. (Ranunculaceae) grows in the Western Himalayas and inner Tibetan valleys at elevations of 10,000-12,000 ft. and is reported to be poisonous to goats (1). In our previous investigation (2) of the aerial parts of D. vestitum, we reported isolation of two new norditerpenoid alkaloids, delvestine [1] and delvestidine [2]. In continuation of our interest in the diterpenoid alkaloids of the genus Delphinium (3) we now report the isolation and structure determination of a new norditerpenoid alkaloid, isodelectine [3], from the aerial parts of D. vestitum. Its structure has been deduced from spectroscopic data and a chemical correlation with delvestine [1]. The known alkaloid anthranoyllycoctonine [4], which has not been previously reported from this plant, was also isolated.