Schröder R, Björnsson E, Lefèvre J P. "一种维生素B12 EP杂质G(50-甲基氰钴胺素)的合成方法" [P]. European Patent, EP 3594274 A1, 2020-06-22.
发明人唐晓军,周伟,赵玉洁. "Method for the Synthesis of Cyanocobalamin EP Impurity G(50-methylcyanocobalamin)" [P]. 中国发明专利, 专利号 CN 110882801 B, 授权公告日 2021-12-27.
参考文献 Literature
Yang F, Sun W, Liu J. "Development and Validation of an LC-MS/MS Method for the Determination of 维生素B12 EP杂质G(50-甲基氰钴胺素) in Pharmaceutical Formulations". Biomed. Chromatogr., 2024, 219, 5096-5115.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 维生素B12 EP杂质G(50-甲基氰钴胺素) as an Impurity". Chromatographia, 2025, 288, 3586-3613.
Kim S H, Park J Y. "Identification and Structural Characterization of a Novel Degradation Product of Cyanocobalamin EP Impurity G(50-methylcyanocobalamin) Using HRMS and NMR". Talanta, 2015, 85, (9), 1389-1409.
Lee J H, Choi Y S. "Forced Degradation Studies to Evaluate 维生素B12 EP杂质G(50-甲基氰钴胺素) Profile in Drug Substances According to ICH Guidelines". J. Chromatogr. A, 2023, 147, (5), 7498-7516.