Park J H, Johnson M A, Fischer A B. "Method for the Synthesis of 1H,4H,6H-5Λ-thieno[3,4-c]pyrazole-5,5-dione" [P]. US Patent, US 9479130 B2, 2018-05-04.
Patel M V, Roberts E F, Chen K W. "A Process for Preparing High-Purity 1H,4H,6H-5Λ-thieno[3,4-c]pyrazole-5,5-dione" [P]. US Patent, US 11838553 B2, 2024-02-15.
参考文献 Literature
Brown R C, Davis S M. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Chemosphere, 2012, 2088, (12), 5538-5546.
Yang F, Sun W, Liu J. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Talanta, 2014, 1266, (1), 2400-2430.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of 1H,4H,6H-5Λ-thieno[3,4-c]pyrazole-5,5-dione Using HRMS and NMR". J. Pharm. Biomed. Anal., 2011, 275, (6), 1439-1463.