1. Department of Chemistry of Bioactive Nitrogen Heterocyclic Bases, V. P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
2. Department of Chemistry, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
3. X-Ray Structural Studies and Quantum Chemistry, SSI «Institute for Single Crystals» of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine