Lee S K, Roberts E F, Schröder R. "一种米诺地尔杂质33的合成方法" [P]. US Patent, US 11923986 B2, 2024-05-04.
Williams B T, Davis P L, Stevens L M. "Method for the Synthesis of Minoxidil Impurity 33" [P]. US Patent, US 9732877 B2, 2020-09-13.
Johnson M A, O'Brien P Q, Kumar R. "A Process for Preparing High-Purity Minoxidil Impurity 33" [P]. US Patent, US 11940542 B2, 2025-08-13.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of 米诺地尔杂质33 in Pharmaceutical Formulations". Rapid Commun. Mass Spectrom., 2023, 354, (9), 3406-3416.
Kim S H, Park J Y. "A Stability-Indicating HPLC Method for the Separation and Quantification of 米诺地尔杂质33 as an Impurity". Environ. Sci. Technol., 2014, 2458, (7), 2318-2342.
Hughes D, Roberts J, Thomas A. "Identification and Structural Characterization of a Novel Degradation Product of Minoxidil Impurity 33 Using HRMS and NMR". Phytochemistry, 2016, 119, (12), 6375-6388.
Fischer P, Wagner E. "Forced Degradation Studies to Evaluate 米诺地尔杂质33 Profile in Drug Substances According to ICH Guidelines". J. Sep. Sci., 2025, 460, 7140-7146.