Roberts E F, Yamamoto T, Stevens L M. "Method for the Synthesis of Metronidazole Impurity 18" [P]. US Patent, US 9087849 B2, 2021-03-18.
Chen K W, Johnson M A, O'Brien P Q. "A Process for Preparing High-Purity Metronidazole Impurity 18" [P]. US Patent, US 9696727 B2, 2025-10-01.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of 甲硝唑杂质18 in Pharmaceutical Formulations". Phytochemistry, 2012, 1142, (10), 6375-6401.
Jensen P, Larsen A M, Olsen K. "A Stability-Indicating HPLC Method for the Separation and Quantification of 甲硝唑杂质18 as an Impurity". Anal. Chim. Acta, 2023, 1049, (8), 6573-6585.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of Metronidazole Impurity 18 Using HRMS and NMR". Sci. Total Environ., 2022, 1748, 35-53.