Patel M V, Mueller T, Johnson M A. "一种的合成方法" [P]. US Patent, US 10930775 B2, 2018-11-10.
Klinger H, Mueller T, Johnson M A. "Method for the Synthesis of 5-(((9H-Fluoren-9-yl)methoxy)carbonyl)-5-azaspiro[2.4]heptane-7-carboxylic acid" [P]. US Patent, US 11660251 B2, 2018-03-15.
发明人孙丽萍,杨光,郑宇鹏. "A Process for Preparing High-Purity 5-(((9H-Fluoren-9-yl)methoxy)carbonyl)-5-azaspiro[2.4]heptane-7-carboxylic acid" [P]. 中国发明专利, 专利号 CN 117892182 B, 授权公告日 2019-04-25.
参考文献 Literature
Kumar A, Sharma P, Patel R S. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Anal. Chim. Acta, 2018, 567, (2), 4736-4741.
Kowalski T, Nowak Z. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Pharm. Biomed. Anal., 2024, 947, 893-921.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of 5-(((9H-Fluoren-9-yl)methoxy)carbonyl)-5-azaspiro[2.4]heptane-7-carboxylic acid Using HRMS and NMR". Chromatographia, 2022, 491, (1), 6013-6033.
Yamamoto K, Tanaka H, Suzuki T. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Chromatogr. A, 2017, 1478, (7), 944-948.