Björnsson E, Nowak P, Martínez F. "Method for the Synthesis of Ethyl 4-cyano-5-(cyclohexanecarboxamido)-3-methylthiophene-2-carboxylate" [P]. European Patent, EP 3728024 A1, 2024-05-25.
Davis P L, Patel M V, Lee S K. "A Process for Preparing High-Purity Ethyl 4-cyano-5-(cyclohexanecarboxamido)-3-methylthiophene-2-carboxylate" [P]. US Patent, US 10589851 B2, 2025-02-22.
参考文献 Literature
Martinez C, Lopez D R. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Chromatogr. A, 2017, 891, (10), 5451-5480.
Mueller T, Schmidt R K. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2011, 284, 2015-2033.
Garcia M, Rodriguez P. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 4-cyano-5-(cyclohexanecarboxamido)-3-methylthiophene-2-carboxylate Using HRMS and NMR". J. Pharm. Biomed. Anal., 2015, 1724, (9), 9717-9736.
Kowalski T, Nowak Z. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Phytochemistry, 2023, 2000, (5), 6688-6704.