1. Department of Chemistry, North Caucasus Federal University, 1a Pushkin Street, Stavropol 355009, Russia
2. Laboratoire
de Cancérologie et de Toxicologie Expérimentale, Faculté
de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
3. Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
4. Department
of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States