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5Ethyl 3,3-diamino-2-(2-p-tolylpyrimidin-4-yl)acrylate, a new representative of hetarylketene aminals, Russian Chemical Bulletin Chelate synthesis of 8-diaminomethylene-5,6,7,8-tetrahydroquinazoline-7-one derivatives, Russian Chemical Bulletin Chelate synthesis of pyrazolyl(ethoxycarbonyl)ketene aminals, the precursors of functionalized pyrazolo[1,5-c]pyrimidines, Russian Chemical Bulletin