1. The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, ICREA and Institute of Chemical Research of Catalonia (ICIQ), Avgda. Paisos Catalans s/n, 43007, Tarragona, Spain, Enamine Ltd., 23 A. Matrosova st., 01103 Kyiv, Ukraine, and National Taras Shevchenko University, 62 Volodymyrska st., Kyiv-33, 01033, Ukraine