Similar names: 3,5-Pyrazolidinedione, 4-butyl-1,2-diphenyl-; 1,2-Diphenyl-3,5-dioxo-4-butylpyrazolidine; 1,2-Diphenyl-3,5-dioxo-4-n-butylpyrazolidine; 1,2-Diphenyl-4-butyl-3,5-pyrazolidinedione; 3,5-Dioxo-1,2-diphenyl-4-n-butylpyrazolidine; 4-Butyl-1,2-diphenyl-3,5-dioxopyrazolidine; 4-Butyl-1,2-diphenylpyrazolidine-3,5-dione; 4-n-Butyl-1,2-diphenyl-3,5-pyrazolidinedione; Alindor; Alkazone; Antadol; Anuspiramin; Arthrizon; Artrizin; Artropan; Azolid; Benzone; Betazed; Bizolin 200; Bunetzone; Butacote; Butadion; Butadione; Butalidon; Butapirazol; Butapirazole; Butartrina; Butatron; Butazina; Butazolidin; Butazolidine; Butidiona; Butoz; Buzon; Diphebuzol; Diphenylbutazone; Ecobutazone; Equipalazone; Fenibutal; Fenibutazona; Fenilbutina; Fenotone; Fenylbutazon; Flexazone; G 13,871; Ia-But; Kadol; Mephabutazon; NSC 25134; Phebuzine; Phen-Buta; Phenylbutazon; Phenylbutazone; Pirarreumol B; Pyrabutol; R-3-ZON; Reudo; Reudox; Reumazin; Reumuzol; Robizone; Shigrodin; Tencodyne; Tevcodyne; Ticinil; Todalgil; Uzone; VAC-10; Zolaphen