Patel M V, Kumar R, Davis P L. "Method for the Synthesis of Ethyl 3-cyclopropyl-6-hydroxy-1-(4-methoxyphenyl)-1h-pyrazolo[3,4-b]pyridine-4-carboxylate" [P]. US Patent, US 11183827 B2, 2018-03-08.
Roberts E F, Yamamoto T, Klinger H. "A Process for Preparing High-Purity Ethyl 3-cyclopropyl-6-hydroxy-1-(4-methoxyphenyl)-1h-pyrazolo[3,4-b]pyridine-4-carboxylate" [P]. US Patent, US 10791976 B2, 2015-06-02.
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". Molecules, 2025, 1252, (12), 7474-7495.
Kim S H, Park J Y. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Sep. Sci., 2016, 1126, (9), 5536-5540.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 3-cyclopropyl-6-hydroxy-1-(4-methoxyphenyl)-1h-pyrazolo[3,4-b]pyridine-4-carboxylate Using HRMS and NMR". J. Nat. Prod., 2024, 2348, 7879-7885.
O'Brien K, Kennedy M L. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Chim. Acta, 2016, 1623, 1658-1671.