Johansson L, Mueller T C, Kowalski A. "Method for the Synthesis of 2-(3-Methyl-6-(thiophen-2-yl)-4-(trifluoromethyl)-1h-pyrazolo[3,4-b]pyridin-1-yl)acetic acid" [P]. European Patent, EP 3816333 A1, 2017-09-21.
参考文献 Literature
Smith J A, Johnson M B. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Agric. Food Chem., 2011, 1117, 5456-5463.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Rapid Commun. Mass Spectrom., 2015, 1794, (5), 5295-5319.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of 2-(3-Methyl-6-(thiophen-2-yl)-4-(trifluoromethyl)-1h-pyrazolo[3,4-b]pyridin-1-yl)acetic acid Using HRMS and NMR". Anal. Chem., 2011, 1044, 461-491.
Hughes D, Roberts J, Thomas A. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Methods, 2016, 251, 8663-8667.