Ukrainets, I. V., T. V. Alexeeva, O. O. Davydenko, and V. V. Grinenko. “The Synthesis and Analgesic Properties of N-(benzyl)-2-Hydroxy-9-Methyl-4-Oxo-4H-pyrido[1,2-a]pyrimidine-3-Carboxamides”. Journal of Organic and Pharmaceutical Chemistry, vol. 13, no. 3(51), Sept. 2015, pp. 9-14, doi:10.24959/ophcj.15.850.