1. Department of chemistry of bioactive nitrogen containing heterocyclic basesV.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of the National Academy of Sciences of Ukraine 1, Murmanskaya str Kyiv 02094 Ukraine
2. Department of Bioorganic and Biological ChemistryO.O. Bogomolets National Medical University 13 T. Shevchenko boul. 01601 Kyiv Ukraine
3. Nizhyn Mykola Gogol State University 2, Grafska Str Nizhyn 16600 Ukraine