1. I. V. Ukrainets, E. V. Mospanova, and L. V. Sidorenko, Khim. Geterotsikl. Soedin., 1034 (2007). [Chem. Heterocycl. Comp., 43, 871 (2007)].
2. S. Matsumura, M. Kise, M. Ozaki, S. Tada, K. Kazuno, H. Watanabe, K. Kunimoto, and M. Tsuda, U. S. Patent 4426381 (1984). http://ep.espacenet.com .
3. D. T. W. Chu and A. K. Claiborne, J. Heterocycl. Chem., 24, 1537 (1987).
4. H. Kondo, M. Taguchi, Y. Inoue, F. Sakamoto, and G. Tsukamoto, J. Med. Chem., 33, 2012 (1990).
5. I. V. Ukrainets, L. V. Sidorenko, O. V. Gorokhova, S. V. Shishkina, and A. V. Turov, Khim. Geterotsikl. Soedin., 736 (2007). [Chem. Heterocycl. Comp., 43, 617 (2007)].