Synonyms: 1-Phenyl-4-butyl-3,5-pyrazolidinedione;1-Phenyl-4-butylpyrazolidin-3,5-dione; 1-Phenyl-4-n-butyl-3,5-dioxopyrazolidine;2-Phenyl-3,5-dihydroxy-4-butylpyrazolidine;4-Butyl-1-phenyl-3,5-dioxopyrazolidine; 4-Butyl-1-phenyl-3,5-pyrazolidinedione;4-Butyl-3,5-dioxo-1-phenyltetrahydropyrazole; Arcobutine; Arcomonol Tablets;Butazone; Mobutazon; Mobutazone; Mobuzon; Mofebutazone; Mofesal; Monazan;Monazon; Monobutyl; Monofen; Monofenew; Monomil; Monophenylbutazone;Monorheumetten; Monozon; Mophebutazone; Mozol; NSC 73725; Reumatox