Kumar R, Lee S K, Patel M V. "Method for the Synthesis of Verapamil EP Impurity B" [P]. US Patent, US 10728442 B2, 2018-02-05.
Johansson L, Martínez F, Mueller T C. "A Process for Preparing High-Purity Verapamil EP Impurity B" [P]. European Patent, EP 3049632 A1, 2024-11-20.
参考文献 Literature
Jensen P, Larsen A M, Olsen K. "Development and Validation of an LC-MS/MS Method for the Determination of 维拉帕米EP杂质B in Pharmaceutical Formulations". Anal. Chim. Acta, 2012, 1624, (5), 4567-4582.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 维拉帕米EP杂质B as an Impurity". J. Chromatogr. A, 2010, 2402, 5200-5215.
Smith J A, Johnson M B. "Identification and Structural Characterization of a Novel Degradation Product of Verapamil EP Impurity B Using HRMS and NMR". Environ. Sci. Technol., 2023, 1335, (3), 1366-1379.
Hughes D, Roberts J, Thomas A. "Forced Degradation Studies to Evaluate 维拉帕米EP杂质B Profile in Drug Substances According to ICH Guidelines". J. Nat. Prod., 2017, 1299, 5530-5538.