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3. Yura, Y., Chem. Pharm. Bull., 1962, vol. 10, p. 372; ibid., p. 376.
4. D’yachkova, S.G., Gusarova, N.K., Nikitina, E.A., Larina, L.I., Sinegovskaya, L.M., Abramov, A.V., and Trofimov, B.A., Russ. J. Gen. Chem., 2001, vol. 71, p. 1721.