N. I. Kobyzhcha, V. M. Holovatiuk, V. V. Rozhkov, and V. I. Kashkovsky, “The synthesis of novel spirocyclic N-aryl-substituted 2-thiopyrimidine-4,6-diones”, J. Org. Pharm. Chem., vol. 17, no. 1(65), pp. 20–27, Mar. 2019.