1. R. Kh. Batulina, Z. V. Pushkareva, et al., Khim.-Farmats. Zh., No. 11, 18 (1970).
2. S. Bazin, Chem. Abstr.,41, 2464 (1947).
3. A. V. Syrkin and L. A. Zaitseva, Pharmacol. i Toksikol.,32, 611 (1969).
4. J. Fernando, W. S. Morgan, and J. W. Hausser, J. Org. Chem.,32, 1120 (1967).
5. J. T. Rily, Chem. Abstr.,43, 1856 (1949).