1. Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
2. Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021 Moscow, Russia
3. Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Prospect 4, 194064 St. Petersburg, Russia
4. Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskie Gory, 119992 Moscow, Russia