Martínez F, Lefèvre J P, Rossi M. "Method for the Synthesis of rel-(2S)-2-methyl-3-[(4R)-4-methyl-2,5-dioxo-imidazolidin-4-yl]propanoic acid" [P]. European Patent, EP 3799345 A1, 2016-12-19.
Hughes D C, Williams B T, Roberts E F. "A Process for Preparing High-Purity rel-(2S)-2-methyl-3-[(4R)-4-methyl-2,5-dioxo-imidazolidin-4-yl]propanoic acid" [P]. US Patent, US 11279426 B2, 2020-10-02.
参考文献 Literature
Wang L, Li J, Zhang H. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Environ. Sci. Technol., 2011, 1163, (2), 5845-5859.
Jensen P, Larsen A M, Olsen K. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Phytochemistry, 2016, 2213, (8), 8980-8996.
Brown R C, Davis S M. "Identification and Structural Characterization of a Novel Degradation Product of rel-(2S)-2-methyl-3-[(4R)-4-methyl-2,5-dioxo-imidazolidin-4-yl]propanoic acid Using HRMS and NMR". Anal. Methods, 2014, 1509, 9097-9105.
Yang F, Sun W, Liu J. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Chem., 2010, 1160, (11), 6013-6019.