Schröder R, Sørensen M, Nowak P. "一种的合成方法" [P]. European Patent, EP 3009952 A1, 2025-05-21.
发明人胡光,黄志刚,徐明华. "Method for the Synthesis of 9-(tert-Butoxycarbonyl)-1-oxa-9-azaspiro[5.5]undecane-2-carboxylic acid" [P]. 中国发明专利, 专利号 CN 113870054 A, 授权公告日 2019-11-23.
发明人郑宇鹏,朱建伟,张德明. "A Process for Preparing High-Purity 9-(tert-Butoxycarbonyl)-1-oxa-9-azaspiro[5.5]undecane-2-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111285779 B, 授权公告日 2022-09-01.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Talanta, 2018, 419, (8), 5270-5287.
Mueller T, Schmidt R K. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Sep. Sci., 2021, 662, 4481-4497.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of 9-(tert-Butoxycarbonyl)-1-oxa-9-azaspiro[5.5]undecane-2-carboxylic acid Using HRMS and NMR". Anal. Chim. Acta, 2023, 1751, 3374-3400.
Zhang Y, Li Q, Chen T. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Rapid Commun. Mass Spectrom., 2015, 531, (10), 4060-4078.