发明人徐明华,罗永刚,李文辉. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 108632668 A, 授权公告日 2023-04-09.
发明人罗永刚,陈志强,张德明. "Method for the Synthesis of 8-Ethyl-4-(4-methylbenzoyl)-1-oxa-4,8-diazaspiro[4.5]decane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109628668 B, 授权公告日 2025-02-23.
发明人刘建华,罗永刚,胡光. "A Process for Preparing High-Purity 8-Ethyl-4-(4-methylbenzoyl)-1-oxa-4,8-diazaspiro[4.5]decane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 116132029 A, 授权公告日 2024-05-14.
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