Schröder R, Roberts E F, Stevens L M. "一种的合成方法" [P]. US Patent, US 11768669 B2, 2022-03-28.
Fischer A B, Patel M V, Klinger H. "Method for the Synthesis of Varenicline Nitroso Impurity 4" [P]. US Patent, US 9314328 B2, 2021-12-24.
Williams B T, Lee S K, Thompson G K. "A Process for Preparing High-Purity Varenicline Nitroso Impurity 4" [P]. US Patent, US 11645398 B2, 2023-03-05.
参考文献 Literature
Zhou X P, Huang L, Wu G. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Molecules, 2022, 366, 3671-3699.
Fischer P, Wagner E. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Chim. Acta, 2010, 689, (11), 5288-5314.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of Varenicline Nitroso Impurity 4 Using HRMS and NMR". Chemosphere, 2024, 1468, (6), 9775-9782.
Xu M, Hu Y, Zhou D. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Nat. Prod., 2023, 699, 4270-4276.