Mueller T, Kumar R, Davis P L. "一种头孢哌酮杂质N9的合成方法" [P]. US Patent, US 9093930 B2, 2015-06-28.
发明人陈志强,朱建伟,冯建国. "Method for the Synthesis of Cefoperazone Impurity N9" [P]. 中国发明专利, 专利号 CN 117605537 A, 授权公告日 2023-08-22.
发明人林芳,罗永刚,马晓峰. "A Process for Preparing High-Purity Cefoperazone Impurity N9" [P]. 中国发明专利, 专利号 CN 115737997 A, 授权公告日 2021-07-16.
参考文献 Literature
O'Brien K, Kennedy M L. "Development and Validation of an LC-MS/MS Method for the Determination of 头孢哌酮杂质N9 in Pharmaceutical Formulations". Chemosphere, 2017, 295, 2937-2957.
Jensen P, Larsen A M, Olsen K. "A Stability-Indicating HPLC Method for the Separation and Quantification of 头孢哌酮杂质N9 as an Impurity". Environ. Sci. Technol., 2011, 390, (1), 1144-1173.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of Cefoperazone Impurity N9 Using HRMS and NMR". Anal. Chem., 2021, 1010, (10), 9099-9103.