1-Phenyl-3-carbethoxypyrazolone 1-Phenyl-5-oxo-2-pyrazoline-3-carboxylic acid, ethyl ester 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-1-phenyl-, ethyl ester 2-Pyrazoline-3-carboxylic acid, 5-oxo-1-phenyl-, ethyl ester (8CI) 3-(Ethoxycarbonyl)-1-phenyl-5-pyrazolone 89-33-8 EINECS 201-899-4 Ethyl 5-oxo-1-phenyl-2-pyrazoline-3-carboxylate NSC 49150