1. Yu. D. Kholodova, L. P. Pasternak, and A. I. Apostolov, Ukr. Biokhim. Zh.,48, 533 (1976).
2. The Plant Riches of the Steppe Reserve and the Askaniya-Nova Botanical Park [in Russian], Kiev (1974).
3. Flora of the USSR [in Russian], Moscow-Leningrad, Vol. 28 (1963), p. 270.
4. M. N. Galbraith and D. H. S. Horn, Austral. J. Chem.,22, 1045 (1969).
5. A. A. Akhrem, I. S. Levina, and Yu. A. Titov, Ecdysones ? Inset Steroid Hormones [in Russian], Minsk (1973).