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Method of preparing pyrimidopyrazines

  • US 2,581,889 A
  • Filed: 07/06/1949
  • Issued: 01/08/1952
  • Est. Priority Date: 07/07/1948
  • Status: Expired due to Term
First Claim
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1. THE PROCESS OF PREPARING PYRIMIDOPYRAZINE DERIVATIVES OF THE TYPE REPRESENTED BY THE FORMULA

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