1. A. A. Semenov and V. G. Kartsev, Principles of the Chemistry of Natural Compounds [in Russian], Vol. 2, ICSPF, Moscow, 2009.
2. A. A. Semenov and V. G. Kartsev, Biological Activity of Natural Compounds [in Russian], ICSPF, Moscow, 2012.
3. A. Huczynski, J. Rutkowski, K. Popiel, E. Maj, J. Wietrzyk, J. Stefanska, U. Majcher, and F. Bartl, Eur. J. Med. Chem., 90, 296 (2015).
4. N. A. Aitkhozhina, E. O. Esbolaev, T. A. Zubenko, K. A. Toibaeva, and L. A. Aleksandrova, Bioorg. Khim., 22, 383 (1996).
5. Z. M. Enikeeva, Chem. Nat. Compd., 35, 556 (1999).