1-Piperazinecarboxylic acid, 4-(2-hydroxypropyl)-, 4-butyl-1,2-diphenyl-5-oxo-2,5-dihydro-1H-pyrazol-3-yl ester 70485-39-1 Urethane d'enol de la phenylbutazone et de la N-(2-hydroxy-n-propyl)piperazine [French]