A new alkaloid, ternatine (C24H33NO5), was isolated from aerial parts of the Delphinium ternatum plant. According to the 1H, 13C NMR, IR, and mass spectra of the base and its triacetate, ternatine was assumed to have the structure of 4β-methyl-7α-isobutyryloxy-11α,15β,19β- trihydroxyhetisane.