1. Institute of Chemical Biology and Fundamental Medicine of the Siberian Branch of the Russian Academy of Science, Lavrentiev Avenue 8, Novosibirsk 630090, Russia
2. Department of Chemistry, Novosibirsk State University, Novosibirsk 630090, Russia
3. Baker Laboratory of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853-1301, USA
4. IMASL-CONICET, Universidad Nacional de San Luis, Ejército de Los Andes 950, 5700 San Luis, Argentina