Yamamoto T, Fischer A B, Williams B T. "一种的合成方法" [P]. US Patent, US 10705016 B2, 2021-09-02.
Roberts E F, Anderson J P, Park J H. "Method for the Synthesis of 5-[(2-Methylpropan-2-yl)oxycarbonyl]-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazine-3-carboxylic acid" [P]. US Patent, US 11431820 B2, 2021-08-10.
Schröder R, Brown S R, Fischer A B. "A Process for Preparing High-Purity 5-[(2-Methylpropan-2-yl)oxycarbonyl]-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazine-3-carboxylic acid" [P]. US Patent, US 9572799 B2, 2017-07-27.
参考文献 Literature
Xu M, Hu Y, Zhou D. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Talanta, 2023, 1996, 988-995.
Wang L, Li J, Zhang H. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Pharm. Biomed. Anal., 2019, 2339, 1147-1154.
Hughes D, Roberts J, Thomas A. "Identification and Structural Characterization of a Novel Degradation Product of 5-[(2-Methylpropan-2-yl)oxycarbonyl]-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazine-3-carboxylic acid Using HRMS and NMR". J. Sep. Sci., 2010, 2283, (3), 1909-1913.