Yamamoto T, Fischer A B, Anderson J P. "Method for the Synthesis of 1H-Pyrazolo[4,3-d]pyrimidine-3-carbonitrile, 7-bromo-5-ethyl-" [P]. US Patent, US 10916347 B2, 2015-11-22.
Jørgensen K, Mueller T C, Nowak P. "A Process for Preparing High-Purity 1H-Pyrazolo[4,3-d]pyrimidine-3-carbonitrile, 7-bromo-5-ethyl-" [P]. European Patent, EP 3000633 A1, 2022-09-03.
参考文献 Literature
Zhang Y, Li Q, Chen T. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Chromatographia, 2016, 1706, (8), 1419-1425.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Nat. Prod., 2019, 1696, (3), 9001-9025.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of 1H-Pyrazolo[4,3-d]pyrimidine-3-carbonitrile, 7-bromo-5-ethyl- Using HRMS and NMR". J. Agric. Food Chem., 2018, 2210, (3), 4191-4218.