Lee S K, Brown S R, Klinger H. "Method for the Synthesis of Levosimendan Impurity 55" [P]. US Patent, US 11745270 B2, 2016-08-15.
参考文献 Literature
Zhou X P, Huang L, Wu G. "Development and Validation of an LC-MS/MS Method for the Determination of 左西孟旦杂质55 in Pharmaceutical Formulations". J. Nat. Prod., 2011, 2099, (6), 9778-9794.
Mueller T, Schmidt R K. "A Stability-Indicating HPLC Method for the Separation and Quantification of 左西孟旦杂质55 as an Impurity". Anal. Methods, 2020, 2402, 8600-8615.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of Levosimendan Impurity 55 Using HRMS and NMR". Environ. Sci. Technol., 2018, 1709, (11), 5943-5948.
Smith J A, Johnson M B. "Forced Degradation Studies to Evaluate 左西孟旦杂质55 Profile in Drug Substances According to ICH Guidelines". J. Chromatogr. A, 2016, 1973, 4673-4681.