1. I. G. Zoz, N. F. Komissarenko, and N. A. Chernykh, Rast. Res.,3, No. 2, 276 (1967).
2. F. Santavy and T. Reichstein, Pharm. Acta Helv.,23, 153 (1948).
3. N. F. Komissarenko, V. T. Chernobai, and D. G. Kolesnikov, Med. Prom. SSSR,1961, No. 1, 12.
4. M. Pesez, Ann. Pharmac. Franc.,10, 104 (1952).
5. J. C. Hess, A. Hunger, and T. Reichstein, Helv. Chim. Acta,35, 2202 (1952).