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Ukrainets, I.V., Bereznyakova, N.L., Taran, K.A. and Davidenko, O.O. 2014. Improved synthesis, spectral characteristics and spatial structure of ethyl 2-hydroxy-8-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carboxylate. Journal of Organic and Pharmaceutical Chemistry. 12, 3(47) (Sep. 2014), 23–27. DOI:https://doi.org/10.24959/ophcj.14.800.