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Synthesis of 2-substituted 7-methylpyrimido[4,5-d]pyrimidin-4(3H)-ones catalyzed by heteropolyacids
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Research on Chemical Intermediates
[DOI: 10.1007/s11164-013-1266-1]
Ishikawa, T., Science of Synthesis, (2004) 16, 1371..
From 2,6-Disubstituted 4-Aminopyrimidine-5-carboxamides
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Science of Synthesis