Lee S K, Anderson J P, Stevens L M. "Method for the Synthesis of 4-(4-Carboxy-benzylidene)-2-methyl-5-oxo-4,5-dihydro-1H-pyrrole-3-carboxylic acid methyl ester" [P]. US Patent, US 9484627 B2, 2016-10-07.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Anal. Methods, 2011, 738, (1), 284-293.
Wang L, Li J, Zhang H. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Talanta, 2013, 1152, (9), 8161-8187.
Yamamoto K, Tanaka H, Suzuki T. "Identification and Structural Characterization of a Novel Degradation Product of 4-(4-Carboxy-benzylidene)-2-methyl-5-oxo-4,5-dihydro-1H-pyrrole-3-carboxylic acid methyl ester Using HRMS and NMR". J. Sep. Sci., 2015, 1529, (9), 1182-1210.