Fischer A B, Brown S R, Anderson J P. "Method for the Synthesis of [(E)-(pyridin-3-ylmethylidene)amino]urea" [P]. US Patent, US 11019947 B2, 2018-12-21.
Sørensen M, Nowak P, Jørgensen K. "A Process for Preparing High-Purity [(E)-(pyridin-3-ylmethylidene)amino]urea" [P]. European Patent, EP 3749497 A1, 2019-09-18.
参考文献 Literature
Lee J H, Choi Y S. "Development and Validation of an LC-MS/MS Method for the Determination of [(E)-(pyridin-3-ylmethylidene)amino]urea in Pharmaceutical Formulations". Environ. Sci. Technol., 2017, 1252, (1), 1559-1571.
Kowalski T, Nowak Z. "A Stability-Indicating HPLC Method for the Separation and Quantification of [(E)-(pyridin-3-ylmethylidene)amino]urea as an Impurity". Rapid Commun. Mass Spectrom., 2011, 1689, (8), 3207-3225.
Garcia M, Rodriguez P. "Identification and Structural Characterization of a Novel Degradation Product of [(E)-(pyridin-3-ylmethylidene)amino]urea Using HRMS and NMR". Chemosphere, 2014, 1576, 8688-8718.
Mueller T, Schmidt R K. "Forced Degradation Studies to Evaluate [(E)-(pyridin-3-ylmethylidene)amino]urea Profile in Drug Substances According to ICH Guidelines". J. Pharm. Biomed. Anal., 2011, 1801, 3887-3893.