Schröder R, Nowak P, Sørensen M. "一种的合成方法" [P]. European Patent, EP 3387415 A1, 2023-01-06.
发明人刘建华,罗永刚,孙丽萍. "Method for the Synthesis of 3-[2-butyl-4-(difluoromethyl)-3-methyl-6-oxo-2h,6h,7h-pyrazolo[3,4-b]pyridin-7-yl]propanoic acid" [P]. 中国发明专利, 专利号 CN 116509460 B, 授权公告日 2024-09-10.
发明人杨光,张德明,沈红梅. "A Process for Preparing High-Purity 3-[2-butyl-4-(difluoromethyl)-3-methyl-6-oxo-2h,6h,7h-pyrazolo[3,4-b]pyridin-7-yl]propanoic acid" [P]. 中国发明专利, 专利号 CN 109867077 B, 授权公告日 2023-04-08.
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