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发明人冯建国,林芳,孙丽萍. "Method for the Synthesis of 4-(2,5-Difluorobenzoyl)-1-oxa-4-azaspiro[4.5]decane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 116362752 B, 授权公告日 2021-10-28.
发明人高志强,孙丽萍,沈红梅. "A Process for Preparing High-Purity 4-(2,5-Difluorobenzoyl)-1-oxa-4-azaspiro[4.5]decane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 115659707 B, 授权公告日 2023-10-07.
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