1-Phenyl-3-carbethoxypyrazolone 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 3-(Ethoxycarbonyl)-1-phenyl-5-pyrazolone 89-33-8 NSC57876