Nielsen H, Jørgensen K, Björnsson E. "Method for the Synthesis of (Z)-4-(4-Chlorophenyl)-2-hydroxy-4-oxobut-2-enoic acid" [P]. European Patent, EP 3562443 A1, 2024-12-28.
Williams B T, Anderson J P, Roberts E F. "A Process for Preparing High-Purity (Z)-4-(4-Chlorophenyl)-2-hydroxy-4-oxobut-2-enoic acid" [P]. US Patent, US 11544359 B2, 2019-09-02.
参考文献 Literature
Lee J H, Choi Y S. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". J. Agric. Food Chem., 2016, 1780, (9), 8910-8935.
Martinez C, Lopez D R. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". Molecules, 2014, 887, 4374-4377.
Zhou X P, Huang L, Wu G. "Identification and Structural Characterization of a Novel Degradation Product of (Z)-4-(4-Chlorophenyl)-2-hydroxy-4-oxobut-2-enoic acid Using HRMS and NMR". Environ. Sci. Technol., 2022, 431, (4), 7350-7362.
Fischer P, Wagner E. "Forced Degradation Studies to Evaluate N/A Profile in Drug Substances According to ICH Guidelines". J. Pharm. Biomed. Anal., 2012, 1262, 9653-9675.