发明人罗永刚,何建平,郭海燕. "Method for the Synthesis of 4-Oxo-1H,4H,5H-pyrazolo[3,4-d]pyrimidine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109946013 B, 授权公告日 2021-04-28.
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