Yamamoto T, Thompson G K, Lee S K. "Method for the Synthesis of 4-ethyl-3-oxo-3,4-dihydroquinoxaline-2-carboxylic acid" [P]. US Patent, US 11025452 B2, 2020-02-03.
Fischer A B, Johnson M A, Schröder R. "A Process for Preparing High-Purity 4-ethyl-3-oxo-3,4-dihydroquinoxaline-2-carboxylic acid" [P]. US Patent, US 11580577 B2, 2020-09-02.
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 4-ethyl-3-oxo-3,4-dihydroquinoxaline-2-carboxylic acid in Pharmaceutical Formulations". Phytochemistry, 2013, 2062, (2), 6723-6737.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 4-ethyl-3-oxo-3,4-dihydroquinoxaline-2-carboxylic acid as an Impurity". J. Agric. Food Chem., 2025, 651, (11), 6661-6675.