1. Enamine, Ltd., Chervonotkatska 78, Kyiv 02094, Ukraine (www.enamine.net)
2. Bienta, Chervonotkatska 78, Kyiv 02094, Ukraine (www.bienta.net)
3. Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska 64, Kyiv 01601, Ukraine (www.mykhailiukchem.org)