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发明人黄志刚,朱建伟,何建平. "Method for the Synthesis of 2-{1-methyl-4-oxo-1H,4H,5H-pyrazolo[3,4-d]pyrimidin-5-yl}acetic acid" [P]. 中国发明专利, 专利号 CN 109573652 B, 授权公告日 2021-08-11.
发明人孙丽萍,赵玉洁,高志强. "A Process for Preparing High-Purity 2-{1-methyl-4-oxo-1H,4H,5H-pyrazolo[3,4-d]pyrimidin-5-yl}acetic acid" [P]. 中国发明专利, 专利号 CN 112300523 B, 授权公告日 2023-10-28.
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