Synthesis of 3-hydroxythienopyrimidine-2,4-(1H,3H)-diones from 2,3- and 3,4-thiophenedicarboxylic acids
Kou-Yi Tserng and Ludwig Bauer
J. Org. Chem.; 1975; 40(2) pp 172 - 175;
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http://dx.doi.org/10.1021/jo00890a004