1. E. M. Cherkasova, N. T. Pryanishnikova, et al., Usp. Khim.,42, 1892 (1973).
2. V. Hach, Z. Hovakova, J. Reichelt, et al., Chem. Listy,13, 547 (1957).
3. Z. Hovakova and V. Hach, Csl. Farm.,4, 234 (1955).
4. V. V. Zakusov, Pharmacology of the Nervous System [in Russian], Moscow (1953).
5. E. Bülbring and J. Wajda, J. Pharmacol. Exp. Ther.,81, 78 (1945).