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USRE35072E 4-substituted pyrazolo[3,4-d]pyrimidine derivatives 失效
4-取代的吡唑并[3,4-d]嘧啶衍生物

4-substituted pyrazolo[3,4-d]pyrimidine derivatives
摘要：
4-Substituted pyrazolo[3,4-d]pyrimidine derivatives and a method of synthesis for the derivatives are described. The 4-substituted pyrazolopyrimidine derivatives are useful as cardiotonic agents and antiarryhythmic agents.
摘要（中）：

描述了4-取代的吡唑并[3,4-d]嘧啶衍生物及其衍生物的合成方法。 4-取代的吡唑并嘧啶衍生物可用作强心剂和抗心律不齐剂。

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