Chen K W, Stevens L M, Brown S R. "一种的合成方法" [P]. US Patent, US 9979277 B2, 2025-04-03.
Klinger H, Fischer A B, Lee S K. "Method for the Synthesis of 3-Isobutyl-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one" [P]. US Patent, US 11445710 B2, 2022-03-18.
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. Pharm. Biomed. Anal., 2013, 1877, 3407-3426.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chemosphere, 2019, 1147, 2342-2366.
Hughes D, Roberts J, Thomas A. "Identification and Structural Characterization of a Novel Degradation Product of 3-Isobutyl-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2020, 1399, (8), 6300-6327.