英文别名5-Pyrazolone-3-carboxylic acid ethyl ester; ethyl 5-oxo-1,4-dihydropyrazole-3-carboxylate; 4,5-Dihydro-5-oxo-1H-pyrazole-3-carboxylic acid ethyl ester; 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-, ethyl ester; 5-Oxo-4,5-dihydro-1H-pyrazole-3-ethyl carboxylic acid; 5-oxo-2,5-dihydro-1H-pyrazole-3-carboxylic acid ethyl ester; ethyl 4,5-dihydro-5-oxo-1H-pyrazole-3-carboxylate; 5-oxo-2-pyrazoline-3-carboxylic acid,ethyl ester; ethyl pyrazol-5-one-3-carboxylate; 3-(carboethoxy)-2-pyrazolin-5-one 
