1. D. Bove and F. Bove-Nitti, Farmakol. i Toksikol., No. 3, p. 201 (1959).
2. W. Kenyon, E. Kaiser, and C. Hauser, J. Org. Chem.,30, 2937 (1965).
3. A. L. Mndzhoyan, G. T. Tatevosyan, S. G. Agbalyan, et al., Dokl. Akad. Nauk ArmyanskSSR,28, No. 1, 11 (1959).
4. C. Hauser and W. Chambers, J. Am. Chem. Soc.,78, 4942 (1956).
5. S. G. Kuznetsov, D. V. Ioffe, Yu. A. Ostrovskaya, et al., USSR Patent No. 213,016; Byull Izobret., No. 10 (1968).