Synonyms: Antipyrine,4-(isopropylamino)- (6CI,7CI,8CI);1-Phenyl-2,3-dimethyl-4-(isopropylamino)-2-pyrazolin-5-one;1-Phenyl-2,3-dimethyl-4-isopropylaminopyrazolone;4-(Isopropylamino)antipyrine;4-(Isopropylamino)phenazone;4-Isopropylamino-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one;4-Monoisopropylamino-1-phenyl-2,3-dimethyl-5-pyrazolone;Isopirina;Isopropylaminoantipyrine;Isopropylaminophenazone;Isopyrine;Ramifenazone;