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发明人张德明,孙丽萍,郑宇鹏. "A Process for Preparing High-Purity 3-(6-Oxopyrazolo[1,5-a]pyrido[3,4-e]pyrimidin-7(6H)-yl)propanoic acid" [P]. 中国发明专利, 专利号 CN 109475209 B, 授权公告日 2021-09-14.
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