Mueller T, Patel M V, Kumar R. "一种甲氨蝶呤杂质61的合成方法" [P]. US Patent, US 9274003 B2, 2017-06-13.
Mueller T, Yamamoto T, O'Brien P Q. "Method for the Synthesis of Methotrexate Impurity 61" [P]. US Patent, US 9765103 B2, 2015-08-18.
参考文献 Literature
Zhang Y, Li Q, Chen T. "Development and Validation of an LC-MS/MS Method for the Determination of 甲氨蝶呤杂质61 in Pharmaceutical Formulations". Anal. Chem., 2017, 146, (8), 6839-6863.
Brown R C, Davis S M. "A Stability-Indicating HPLC Method for the Separation and Quantification of 甲氨蝶呤杂质61 as an Impurity". Anal. Chim. Acta, 2014, 1369, (12), 3004-3028.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of Methotrexate Impurity 61 Using HRMS and NMR". J. Nat. Prod., 2016, 728, (2), 6754-6783.
Zhou X P, Huang L, Wu G. "Forced Degradation Studies to Evaluate 甲氨蝶呤杂质61 Profile in Drug Substances According to ICH Guidelines". J. Sep. Sci., 2013, 910, 2408-2435.