Synonyms: 3,5-Pyrazolidinedione,4-butyl-1-(p-hydroxyphenyl)-2-phenyl- (6CI,7CI,8CI); 1-(p-Hydroxyphenyl)-2-phenyl-4-butyl-3,5-pyrazolidinedione;1-Phenyl-2-(p-hydroxyphenyl)-3,5-dioxo-4-butylpyrazolidine;1-Phenyl-2-(p-hydroxyphenyl)-3,5-dioxo-4-n-butylpyrazolidine;1-p-Hydroxyphenyl-2-phenyl-3,5-dioxo-4-n-butylpyrazolidine;4-Butyl-2-(4-hydroxyphenyl)-1-phenyl-3,5-dioxopyrazolidine;4-Butyl-2-(p-hydroxyphenyl)-1-phenyl-3,4-pyrazolidinedione;4-Butyl-2-(p-hydroxyphenyl)-1-phenyl-3,5-pyrazolidinedione; Butapirone;Californit; Crovaril; Flamaril; Floghene; Flogitolo; Flogoril; Frabel; G 27202;Metabolite I; NSC 526053; Neo-Farmadol; Offitril; Oxalid; Oxazolidin;Oxyphenbutazone; Oxyphenobutazone; Oxyphenylbutazone; Rapostan; Ro 04-4410;Romaxin; Suganril; Tandacote; Tandearil; Tanderil; Telidal; Tendearil;Visubutina; p-Hydroxyphenylbutazone; p-Oxyphenylbutazone