Synthesis of functionalized pyrimidine-4-thiones and derivatives of pyrido[2,3-d]pirimidine-5-one from monoacylketene aminals - Dorokhov, V. A.; Komkov, A. V.; Shashkova, E. M.; Bogdanov, V. S.; Bochkareva, M. N. (Springer, 1993)
http://dx.doi.org/10.1007/BF00699001
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