发明人张德明,王建平,高志强. "Method for the Synthesis of 3-(1-Methyl-4-oxo-4,5-dihydro-1H-pyrazolo[3,4-d]pyrimidin-6-yl)propanoic acid" [P]. 中国发明专利, 专利号 CN 109156189 A, 授权公告日 2016-01-20.
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