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DERIVATIVES OF CONDENSED THIENO[2,3-<i>d</i>]PYRIMIDINES. 20. SYNTHESIS OF 2-SUBSTITUTED 5,6-DIHYDRO-8H-PYRANO[4',3':4,5]THIENO[2,3-<i>d</i>]PYRIMIDIN-4(3H)-ONES AND 5,6,7,8-TETRAHYDROBENZO[<i>b</i>]THIENO[2,3-d]PYRIMIDIN-4-ONES
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