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Zinchenko, H. M.; Muzychka, L. V.; Verves, Y. V.; Smolii, O. B. A Convenient Approach to the Synthesis of New 4-Amino Substituted Derivatives pyrido[2,3-d]pyrimidin-7-One. J. Org. Pharm. Chem. 2016, 14, 40-47.