V. L. Gein, I. V. Krylova, E. P. Tsypliakova, A. R. Gaifullina, L. I. Varkentin and M. I. Vakhrin, Synthesis of methyl esters of 5-aroyl-6-aryl-2-oxo-1,2,3,6-tetra-hydropyrimidine-4-carboxylic acids, Volume 45, Number 7, 829-832
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http://dx.doi.org/10.1007/s10593-009-0353-0