Hughes D C, Yamamoto T, Kumar R. "一种的合成方法" [P]. US Patent, US 9563980 B2, 2022-11-01.
Yamamoto T, Hughes D C, Chen K W. "Method for the Synthesis of 5-Amino-1-ethyl-1H-pyrazole-4-carbonitrile" [P]. US Patent, US 9296866 B2, 2018-08-11.
Roberts E F, Thompson G K, Lee S K. "A Process for Preparing High-Purity 5-Amino-1-ethyl-1H-pyrazole-4-carbonitrile" [P]. US Patent, US 11638797 B2, 2020-07-13.
参考文献 Literature
Jensen P, Larsen A M, Olsen K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Rapid Commun. Mass Spectrom., 2013, 1285, 7449-7478.
Kim S H, Park J Y. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Agric. Food Chem., 2011, 1798, (11), 9696-9703.