发明人罗永刚,李文辉,陈志强. "Method for the Synthesis of (3R,4S)-4-(4-methoxyphenyl)-2-oxo-1-azaspiro[4.4]Nonane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 116658986 A, 授权公告日 2016-05-28.
发明人沈红梅,何建平,陈志强. "A Process for Preparing High-Purity (3R,4S)-4-(4-methoxyphenyl)-2-oxo-1-azaspiro[4.4]Nonane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 108982957 A, 授权公告日 2015-08-03.
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